Preheat oven to 350°. In a mixing bowl, combine the butter or margarine, 1 Cup of the sugar and the eggs. Beat until light and fluffy. Add the sour cream and VANILLA; blend thoroughly on low. In another bowl, sift together the flour, baking powder and baking soda. Add gradually to the beaten mixture. Pour half of the batter into a greased and floured 9x13 baking pan. In a small bowl, combine the remaining sugar with the CINNAMON. Sprinkle half of the sugar-cinnamon mixture and half of the chocolate chips over the batter. Pour the remaining batter into the pan and sprinkle with the remaining sugar-cinnamon mixture and chocolate chips on top. Bake at 350° for 30 minutes. Cool in the pan on a rack. Serve with vanilla ice cream or whipped cream.
Prep. time: 15 minutes
Baking time: 30 minutes
Servings 12; Serving Size 1 piece (108g); Calories 390; Calories from fat 160; Total fat 18g; Cholesterol 60mg; Sodium 240mg; Carbohydrate 57g; Dietary Fiber 2g; Sugars 38g; Protein 5g.