Prepare the Oven and Pan: Preheat the oven to 350°F (175°C). Take a 9x13 inch baking pan and thoroughly grease it to ensure the bars won't stick after baking. This step is crucial for easy removal later.
Mix Dry Ingredients: In a medium bowl, whisk together the flour, baking powder, and salt until well combined. Whisking ensures even distribution of the leavening agents throughout the flour, which will help your bars rise uniformly.
Cream Butter and Sugar: In a large bowl, cream together the softened butter and 1 3/4 cups sugar until the mixture becomes light and fluffy, about 2-3 minutes. This process incorporates air into the batter, contributing to a tender texture in the finished bars.
Add Wet Ingredients: Beat in eggs one at a time, making sure each egg is fully incorporated before adding the next. This gradual addition helps create a smooth, emulsified batter. Stir in the vanilla extract, which adds depth of flavor to the bars.
Combine Mixtures: Gradually add the flour mixture to the wet ingredients, stirring until just combined. Be careful not to overmix, as this can develop gluten and make your bars tough instead of tender. Stop mixing as soon as no dry flour is visible.
Transfer to Pan: Spread the batter evenly in the prepared baking pan, using a spatula to smooth the top. The batter will be thick, so take your time to ensure it reaches the corners and has an even thickness throughout.
Add Cinnamon Sugar Topping: In a small bowl, mix together 2 tablespoons sugar and cinnamon until well combined. Sprinkle this mixture evenly over the top of the batter, creating the signature snickerdoodle flavor and appearance.
Bake: Bake for 25-30 minutes, or until the edges are golden brown and a toothpick inserted into the center comes out clean or with a few moist crumbs. The bars will continue to set as they cool, so be careful not to overbake.
Cool and Serve: Allow the bars to cool completely in the pan before cutting into squares and serving. This cooling period is essential for the bars to set properly and for the flavors to fully develop.
