Grandma Row's Butterscotch Brownies

Ingredients
½ cup butter
2 cups brown sugar
3 eggs (Note: Grandma's recipe calls for 2 eggs, but an extra egg helps the brownies cook in the center)
1 ½ cups flour
2 tsp. baking powder
1 tsp. salt
1 tsp. vanilla
1 cup chopped nuts (pecans or walnuts)

Instructions
Preheat oven to 350º
Mix together the butter, sugar, and eggs.
Sift the flour, baking powder and salt.
Add to the mix, along with the vanilla and nuts.
Mix together (may need to mix or stir by hand because the batter is very thick).
Spread into a well-greased and floured 9x13 pan.
Bake for 35 minutes.