Funfetti sugar cookie bars are the perfect dessert for your next celebration. They're filled with fun rainbow sprinkles and turn out perfectly tender and soft, just like your favorite soft sugar cookie recipe.
Preheat oven to 350 degrees Fahrenheit. Line a 9x13 pan with parchment paper (or lightly grease) and set aside.
In a large mixing bowl, add butter and sugar. Cream together until fluffy, about a minute. Add eggs and vanilla extract and mix until fluffy, about a minute.
In a separate bowl, add flour, baking powder, and salt. Whisk or sift together to remove lumps. Gently stir dry ingredients into wet ingredients until just incorporated. Add rainbow sprinkles and stir to incorporate.
Pour into prepared pan and use a spatula to spread evenly to the edges. Batter will be thick. Sprinkle reserved granulated sugar evenly over the top of the batter.
Bake for about 20-22 minutes, or until lightly browned around the edges and bars are set in the center.
Place pan onto a wire rack and allow to cool completely before removing and slicing.
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Notes
If making bars ahead of time for an event, store bars whole (do not slice) until the day of. This helps your bars retain as much moisture as possible. Bars are best served within 24 hours of preparing and will begin to dry out over time.
Bars can be frozen for up to 3 months in a tightly sealed freezer-safe container. To thaw, place on the counter top for 30 minutes to an hour.