Preheat Oven: Start by preheating your oven to 350°F (175°C). This ensures your Christmas Sugar Cookie Bars bake evenly and come out perfectly!
Prepare the Pan: Line a 9x9 inch baking pan with parchment paper to prevent sticking and make cleanup a breeze.
Cream Butter and Sugar: In a mixing bowl, cream the softened butter and sugar together until fluffy and light in color. This usually takes about 2-3 minutes.
Add Wet Ingredients: Beat in the large egg and vanilla extract, mixing well until combined and smooth. This adds a delicious, warm flavor to your bars.
Mix Dry Ingredients: Gradually add the all-purpose flour and baking powder to the wet mixture, stirring until a thick dough forms. Be careful not to overmix!
Fold in Sprinkles: Gently mix in the festive sprinkles, allowing them to fold into the dough without breaking.
Spread and Bake: Spread the batter evenly into the prepared pan. Bake for 20 minutes or until the edges are golden brown, and a toothpick comes out clean from the center.
Cool Completely: Let the bars cool completely in the pan before frosting to ensure a smooth finish.
Prepare the Frosting: In a new bowl, blend powdered sugar, softened butter, cream cheese, vanilla extract, and milk until smooth. Adjust with more milk if necessary for the perfect consistency.
Frost and Decorate: Once the bars are cool, spread the frosting generously on top and feel free to add additional sprinkles for that festive touch.
Cut and Serve: Slice the bars into squares, and they're ready to be enjoyed! You can serve them right away or let the frosting set for a firmer texture.