Heat oven to 350°F. Grease bottom only of 9-inch square pan with shortening or spray bottom with cooking spray. In large bowl, stir coffee cake ingredients with spoon just until dry ingredients are moistened. Spread batter in pan.
Bake 30 to 40 minutes or until toothpick inserted in center comes out clean.
Generously pierce hot cake with fork. Brush or drizzle 1/4 cup melted butter over hot cake. In small bowl, mix 3 tablespoons sugar and the cinnamon; sprinkle over hot cake. Serve warm.