1/2 cup melted butter
1 cup sugar
1 tsp. vanilla
2 eggs
1/2 cup flour
1/3 cup cocoa
1/4 tsp. baking powder
1/4 tsp. salt
1/2 cup nuts (optional)
1/2 cup chocolate chips (optional, but I like peanut butter chips!)

Preheat oven to 350 degrees.

Grease 9 x 9 pan.  In large mixing bowl, blend melted butter, sugar, and vanilla.  Add eggs, beat well with fork.  Combine flour, cocoa, powder, and salt in separate bowl, blend into egg mixture.  Add nuts/chocolate chips if desired.  

Bake 20-25 minutes or until brownies begin to pull away from sides.  Cool.