01 -
Preheat your oven to 350°F (175°C).
02 -
Line a 9×13 inch baking pan with parchment paper, allowing some overhang on the sides for easy removal later.
03 -
In a medium bowl, whisk together the flour, baking powder, baking soda, and salt until well combined.
04 -
In a large bowl, cream together the butter, granulated sugar, and brown sugar until light and fluffy. Then, mix in the eggs and vanilla extract until fully incorporated.
05 -
Gradually add the dry ingredients to the wet mixture, mixing until just combined. Be careful not to overmix.
06 -
Fold in the chocolate chips, nuts (if using), and half of the sprinkles, ensuring they are evenly distributed throughout the batter.
07 -
Pour the batter into the prepared baking pan, spreading it evenly into the corners and smoothing the top. Sprinkle remaining decorative sprinkles on top.
08 -
Place the pan in the preheated oven and bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean and edges are golden brown.
09 -
Remove the pan from the oven and let it cool in the pan for about 10 minutes. Then, lift the bars out using the parchment paper and allow them to cool completely on a wire rack.
10 -
Once cooled, cut the cookie bars into squares or rectangles as desired and serve.