This vintage recipe is a classic, guests drool over it

Ingredients:
– 3 eggs, room temperature
– 1 cup butter, room temperature
– 2 cups brown sugar
– 1.5 cup semi-sweet chocolate chips
– 1 cup milk chocolate chips
– 2.5 cups flour
– 2 teaspoons baking powder
– 1 teaspoon salt
– 1 tablespoon vanilla extract
– Optional: 1/2 cup nuts of your choice
Instructions:
1. Preheat oven to 350°F. Grease a 9×13-inch baking pan and set it aside.
2. In a large mixing bowl, cream together the room temperature butter and brown sugar until light and fluffy.
3. Add the eggs to the butter and sugar mixture one at a time, beating well after each addition. Make sure the eggs are at room temperature to avoid curdling the butter.
4. Stir in the vanilla extract.
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