Creating Gooey Christmas Cookie Bars is a simple and enjoyable process. Follow these steps for a delicious outcome:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking pan or line it with parchment paper for easy removal.

2. Mix the Wet Ingredients: In a large mixing bowl, combine the melted butter, brown sugar, and granulated sugar. Mix until well blended. Add the eggs and vanilla extract, stirring until smooth.

3. Combine Dry Ingredients: In another bowl, whisk together the flour, baking powder, baking soda, and salt.

4. Combine Mixtures: Gradually add the dry ingredients to the wet mixture, stirring just until combined. Be careful not to overmix.

5. Fold in Chocolate Chips: Gently fold in the chocolate chips, ensuring they are evenly distributed throughout the batter.

6. Transfer to Baking Pan: Pour the batter into the prepared baking pan. Use a spatula to spread it evenly.

7. Add Sprinkles: If desired, sprinkle holiday-themed sprinkles on top of the batter for a festive touch.

8. Bake: Place the pan in the preheated oven and bake for 25-30 minutes. The edges should be lightly golden, while the center remains gooey.

9. Cool: Remove from the oven and allow the cookie bars to cool in the pan for about 10-15 minutes before cutting into squares.

10. Serve: Enjoy these delicious bars warm, or let them cool completely for a firmer texture.