Chocolate Chip Muffins

INGREDIENTS

• 2 cups all-purpose flour
• 1/3 cup light-brown sugar, packed
• 1/3 cup sugar
• 2 teaspoons baking powder
• 1/2 teaspoon salt
• 2/3 cup milk
• 1/2 cup butter, melted and cooled
• 2 eggs, lightly beaten
• 1 teaspoon vanilla
• 1 (11 1/2 ounce) package milk chocolate chips
• 1/2 cup walnuts or 1/2 cup pecans, chopped