Ingredients
— The Cookie Base —
1 cup (2 sticks) unsalted butter, softened to room temperature
1 1/2 cups granulated sugar
2 large eggs, room temperature
2 teaspoons pure vanilla extract
3 cups all-purpose flour
1 teaspoon baking powder
1/2 teaspoon salt
— The Buttercream Frosting —
1/2 cup (1 stick) unsalted butter, softened
2 1/2 cups powdered sugar (confectioners’ sugar)
1 teaspoon vanilla extract
1-2 tablespoons heavy cream or milk (to adjust consistency)
Pinch of salt
Food coloring (optional)
Sprinkles (for garnish)
Instructions
1. **Preheat:** Preheat your oven to 350°F (175°C). Lightly grease a 9×13 inch baking pan with non-stick spray or line it with parchment paper for easy removal.
2. **Cream Butter & Sugar:** In a large bowl or stand mixer, beat the 1 cup of softened butter and granulated sugar together on medium speed until light and fluffy (about 2–3 minutes).
3. **Add Wet Ingredients:** Add the eggs one at a time, beating well after each addition. Stir in the vanilla extract.
4. **Combine Dry Ingredients:** Reduce the mixer speed to low. Gradually add the flour, baking powder, and salt. Mix just until the flour creates a soft, thick dough. Do not overmix, or the bars will be tough.
5. **Press into Pan:** Transfer the dough to the prepared baking pan. Use a spatula (or your hands—lightly floured if sticky) to press the dough into an even layer covering the bottom of the pan.
6. **Bake:** Bake for 12–15 minutes. The edges should be very light golden brown, but the center should still look soft and pale. **Do not overbake!** They will continue to set as they cool.
7. **Cool:** Remove from the oven and place the pan on a wire rack. Let the bars cool completely in the pan before frosting (about 1 hour). If you frost them while warm, the butter in the frosting will melt.
8. **Make Frosting:** While the bars cool, beat the 1/2 cup butter for the frosting until smooth. Add the powdered sugar, vanilla, and 1 tablespoon of cream/milk. Whip on high speed for 2 minutes until fluffy. Add more milk if it’s too thick, or more sugar if it’s too thin. Tint with food coloring if desired.
9. **Assemble:** Spread the frosting evenly over the cooled cookie bars. Top immediately with sprinkles.
10. **Serve:** Cut into squares and serve. Store leftovers in an airtight container.
Notes
Softness Secret: The key to soft bars is underbaking them slightly. If the edges turn dark brown, they will be crunchy rather than soft and chewy.
Room Temperature Ingredients: Ensure your butter and eggs are at room temperature so they emulsify properly, creating a smooth, uniform dough.
Flavor Variations: You can add almond extract or lemon zest to the dough for a different flavor profile.
Clean Cuts: For sharp, clean squares, chill the frosted bars in the fridge for 20 minutes before cutting with a sharp knife.
- Prep Time: 15
- Cook Time: 15
- Category: Dessert
- Method: Baking
- Cuisine: American
- Diet: Vegetarian