All ingredients ready? Let's begin!
Preheat the oven to 350F.
Prepare a 9x9 inch baking dish by rubbing the bottom and sides with a little butter or spraying with non-stick spray.
In a large mixing bowl, add the flour, sugar, baking powder, cocoa powder, and salt. Whisk to combine.
In a microwave-safe bowl, melt the butter in the microwave.
Add to the butter the Dr Pepper, vanilla, and eggs. Whisk until well incorporated.
Add the wet ingredients to the dry ingredients and mix together until thoroughly combined. You may need to switch from a whisk to a spatula.
Dump in the chocolate chips and fold into the batter.
Pour the batter into the previously prepared baking dish and smooth the top with a spatula.
Cook for 35 minutes or until you can insert a toothpick or fork and it comes out clean.
Remove from the oven and let cool. You can turn the dish upside down and dump the brownies onto a wire cooling rack or leave them in the pan.
Once cool, cut into squares and serve.