Thick and easy, these moist Lemon Sheet Cake are bursting with citrus flavor. Topped with a luscious lemon buttercream frosting, you’ll LOVE this recipe!
Why this Recipe is Best
These tender, moist cake bars were a happy accident in my kitchen.
Originally I set out to make lemon COOKIE bars with a sweet lemon buttercream frosting. But, during the process, a few changes were made and the end result was too fantastic to fix!
What I love about these Lemon Cake Bars is they aren’t overly sweet. You know, that cloyingly sweetness that you can’t manage to finish one bar.
- Makes a 13×9- easy!
- Perfect for sharing
- Freezer friendly
Unlike these Gooey Lemon Cake Bars that start with a cake mix, today’s recipe is from scratch, but so easy!
How to Make Lemon Cake Bars
STEP 1. Cake Bars.
Preheat oven to 350 degrees F. Line a 13×9-inch baking dish with parchment paper or spray with non-stick baking spray (or use my homemade cake release).
In a large mixing bowl, beat softened butter with sugar until creamy. Add in eggs, vanilla, sour cream, and lemon juice, scraping down the sides of the bowl as needed.
Using a wooden spoon (so you do not over mix), add in flour, lemon zest, baking powder, baking soda, and kosher salt.
Spread batter in the prepared baking dish. Bake for 18-20 minutes, remove and cool on wire rack.
STEP 2. Lemon Frosting.
For the frosting, beat softened butter with powdered sugar, lemon juice, lemon zest, and heavy cream. Beat until light and fluffy, for about 3-5 minutes, scraping down the sides of the mixing bowl as needed.
Spread frosting over cooled cake bars. Slice and enjoy.
Storing Lemon Cake Bars
Store these lemon cake bars in an airtight container at room temperature.
You can refrigerate these bars if you prefer them chilled (I enjoy them both ways)!
Freezing Lemon Cake Bars
What I love about these cake bars is they freeze beautifully.
You can freeze them with or without the frosting! Just know that the texture will change slightly when frozen with frosting on top.
To freeze, wrap cake bars in plastic wrap then a layer of foil (or slide into a freezer safe ziploc bag or airtight container). Freeze for up to 30 days.
Thaw lemon cake bars overnight in refrigerator or at room temperature. ENJOY.
Tips for Lemon Bars
- Start with softened butter.
- Do not over mix batter, use a wooden spoon to incorporate dry ingredients.
- Use fresh squeezed lemon (not bottled lemon concentrate)
- Cool completely before adding the frosting!
MORE Lemon Desserts
- Lemon Cheesecake Bars
- The BEST Lemon Bars
- Lemon Poke Cake
- Lemon Biscotti
- Coconut Lemon Cake
- Lemon Bundt cake
More Easy Dessert Recipes
- Peanut Butter Cheesecake – in the Instant Pot
- Rice Krispie Treats
- Peanut Butter Rice Krispie Treats
- Chocolate Cheesecake
- No Bake Cookies
- Sugar Cookies
Thick and easy, these moist Lemon Cake Bars are bursting with citrus flavor. Topped with a luscious lemon buttercream frosting, you’ll LOVE this recipe!