My mom taught me the recipe for these when I was a kid and it's so easy that I've never forgotten.
Preheat the oven to 350.
Melt 1/2 cup (1 stick) of butter. I usually do this in the microwave in a microwave safe bowl like Pyrex.
Stir in 1 cup of light brown sugar, packed.
Stir in 1 teaspoon of baking powder, 1 teaspoon of salt, and 1 teaspoon of vanilla.
Stir in 1 large egg. At this point, the batter should be pretty liquid.
Stir in 1 cup of flour. Don't worry if the batter is still thin and "goopy". It should be.
Throw in as many chocolate chips and/or caramel chips as you want ( i usually use half a bag).
Pour batter in an ungreased pan, a 9 or 10" square works well for thick, chewy brownies.
Bake for approx 40 minutes.
When you take it out of the over, it should still look a little gooey. Slice into squares while still hot but wait till cool to gobble them up!