Lemon Oat Bars

Lemon Oat Bars

Lemon Oat Bars are a bright, comforting bar cookie with a tender oat crumble and a creamy, tangy lemon center. The crust and topping are buttery and slightly chewy, with the oats adding a pleasant heartiness that balances the sweet, silky lemon filling. On the nose you will notice fresh citrus zest and warm brown sugar, and the texture contrasts between a crisp rim, soft filling, and crumbly oat topping make each bite satisfying. These bars are ideal for spring picnics, afternoon tea, or a simple dessert after dinner when you want something homemade but not fussy. If you enjoy easy oat desserts, you might also like a simple fruit option like 3-ingredient apple oatmeal bars which share the same wholesome oat base and effortless prep.

Ingredients

• 7 Tablespoons unsalted butter, softened — provides richness and helps bind the crust and topping.
• 3/4 cup packed light or dark brown sugar — adds sweetness and a touch of molasses flavor; dark brown sugar gives a deeper taste.
• 1 teaspoon pure vanilla extract — enhances overall flavor and rounds out the sweetness.
• 1 cup all-purpose flour — forms the structure of the crumbly crust and topping.
• 1 teaspoon baking powder — gives a light lift to the oat crumble for a better texture.
• 1/4 teaspoon salt — balances sweetness and enhances the lemon notes.
• 1 cup old-fashioned whole oats or quick oats — adds chew and oat flavor; old-fashioned will be chewier and quick oats will create a finer crumb. See an alternative oat bar style like no-bake blueberry oatmeal bars for another oat-based option.
• 1 (14-ounce) can full-fat sweetened condensed milk — makes the lemon filling creamy and luxuriously sweet.
• 6 Tablespoons lemon juice — provides bright, tart citrus flavor that sets the filling.
• 1 Tablespoon lemon zest — concentrates fresh lemon aroma and flavor.

Step-by-Step Instructions

1. Preheat the oven to 350°F (177°C) and line an 8-inch square pan with parchment paper. Let the parchment hang over the sides for easy lifting.
2. For the crust and topping, beat the softened butter and brown sugar on medium-high speed until well combined. Add the vanilla extract and continue to beat until fully incorporated. Tip: use room temperature butter so it creames smoothly with the sugar.
3. Add the all-purpose flour, baking powder, salt, and oats to the bowl, mixing until the mixture becomes crumbly. The mixture should hold together when pressed between your fingers.
4. Press a bit more than half of the mixture into the bottom of the prepared pan and bake for 12 minutes. Press evenly for a firm base; a flat-bottomed measuring cup helps create a compact crust.
5. For the lemon filling, whisk together the sweetened condensed milk, lemon juice, and lemon zest until the mixture thickens. Whisk until smooth so the filling sets evenly.
6. Pour the lemon filling over the hot crust and sprinkle with the remaining crumble mixture. Distribute the topping so some filling peeks through for visual contrast.
7. Bake for an additional 22 to 25 minutes, or until the edges are lightly browned. A slightly jiggly center is fine; it will firm up as it cools.
8. Allow to cool completely on a wire rack, then cut into squares. For clean slices chill briefly before cutting. For a variation in texture, see how other oat bars press and bake in recipes like chocolate peanut butter oatmeal bars where a firm press creates a dense base.

Recipe Details

• Prep Time: 15 minutes
• Cook Time: 34 to 37 minutes total (12 minutes first bake, 22 to 25 minutes second bake)
• Total Time: 50 to 55 minutes including cooling setup
• Servings: 12 bars
• Calories: approximately 285 calories per bar

Tips, Storage & Variations

• Tips: Soften butter to room temperature for even mixing. Use parchment with overhang to lift the bars from the pan easily. Cool completely before slicing to keep edges neat.
• Storage: Store bars in an airtight container at room temperature for up to 2 days. Refrigerate for up to 5 days to preserve freshness.
• Freezing: Wrap individual bars tightly in plastic wrap and place in a freezer safe container for up to 2 months. Thaw overnight in the refrigerator or bring to room temperature before serving.
• Flavor variations using existing ingredients only:
  • Swap old-fashioned oats for quick oats for a finer, softer crumb.
  • Use dark brown sugar instead of light brown sugar for a richer, molasses note.
  • Double the lemon zest in the filling for a brighter lemon aroma while keeping the same lemon juice amount.
• For another carrot flavored oat bar idea refer to a similar oat bar guide such as carrot cake oatmeal bars for inspiration on mixing oats with bold flavors.

FAQ

1. How long do Lemon Oat Bars last at room temperature?
   They keep well in an airtight container for up to 2 days at room temperature, or up to 5 days refrigerated.

2. Can I use quick oats instead of old-fashioned oats?
   Yes, quick oats will work and will produce a slightly finer, less chewy texture.

3. Do I need to chill the filling before baking?
   No, the lemon filling is poured directly over the hot crust and baked immediately as directed.

4. Can I reduce the sweetness of the filling?
   The filling relies on sweetened condensed milk for structure and sweetness. Reducing it would change the outcome, so follow the recipe amounts for best results.

5. How do I get clean slices when cutting the bars?
   Chill the pan briefly after cooling, use a sharp knife, and wipe the blade between cuts for neat edges.

People Also Ask

1. Are Lemon Oat Bars gluten free?
   Not as written. They use all-purpose flour, which contains gluten. For a gluten free version swap the flour for a gluten free blend, keeping the same weight and texture considerations in mind.

2. Can I make these bars in a different size pan?
   Yes, you can use a similar volume pan like a 9-inch square, but baking times may change slightly. Watch the crust and edges for light browning.

3. Will the sweetened condensed milk set firmly?
   Yes, when baked it firms to a creamy but sliceable consistency that holds between the crust and topping.

4. Can I use margarine or a butter substitute?
   Margarine may change flavor and texture because butter contributes both flavor and structure. Use at your own discretion.

5. Is lemon juice from concentrate acceptable?
   Yes, as long as it is 100 percent lemon juice, it will provide the necessary acidity and flavor.

6. Can I double the recipe for a larger batch?
   Yes, double all ingredients and use a larger pan, adjusting the bake time until the edges are lightly browned and the center is set.

Conclusion

I hope these Lemon Oat Bars bring a bright, comforting treat to your table. If you want another lemon oat take with a slightly different texture, check out Oatmeal Lemon Crumble Bars – Sally’s Baking Addiction for inspiration. For a version inspired by a classic cookbook, see this adaptation at Lemon Oat Bars from 100 Cookies | My Other More Exciting Self. Please try the recipe, share your photos, and tell me how you served them for your next cozy gathering.

See also  Pecan Pie Cookies

Lemon Oat Bars

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A bright and comforting bar cookie with a tender oat crumble and creamy lemon center, perfect for spring picnics or afternoon tea.

• Author: daniel-kim
• Prep Time: 15 minutes
• Cook Time: 34 minutes
• Total Time: 50 minutes
• Yield: 12 bars 1x
• Category: Dessert
• Method: Baking
• Cuisine: American
• Diet: Vegetarian

Ingredients

Scale 1x2x3x

• 7 Tablespoons unsalted butter, softened
• 3/4 cup packed light or dark brown sugar
• 1 teaspoon pure vanilla extract
• 1 cup all-purpose flour
• 1 teaspoon baking powder
• 1/4 teaspoon salt
• 1 cup old-fashioned whole oats or quick oats
• 1 (14-ounce) can full-fat sweetened condensed milk
• 6 Tablespoons lemon juice
• 1 Tablespoon lemon zest

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Instructions

1. Preheat the oven to 350°F (177°C) and line an 8-inch square pan with parchment paper.
2. Beat the softened butter and brown sugar on medium-high speed until well combined.
3. Add the vanilla extract and continue to beat until fully incorporated.
4. Mix in the all-purpose flour, baking powder, salt, and oats until crumbly.
5. Press a bit more than half of the mixture into the bottom of the prepared pan and bake for 12 minutes.
6. Whisk together the sweetened condensed milk, lemon juice, and lemon zest until thickened.
7. Pour the lemon filling over the hot crust and sprinkle with the remaining crumble mixture.
8. Bake for an additional 22 to 25 minutes, or until the edges are lightly browned.
9. Allow to cool completely on a wire rack, then cut into squares.

Notes

For clean slices, chill briefly before cutting. Store in an airtight container at room temperature for up to 2 days or refrigerate for up to 5 days.

Nutrition

• Serving Size: 1 bar
• Calories: 285
• Sugar: 10g
• Sodium: 200mg
• Fat: 12g
• Saturated Fat: 7g
• Unsaturated Fat: 4g
• Trans Fat: 0g
• Carbohydrates: 40g
• Fiber: 2g
• Protein: 3g
• Cholesterol: 30mg