Heat oven to 350°F. Spray bottom only of 9-inch square pan with nonstick cooking spray. Lightly spoon flour into measuring cup; level off. In large bowl, combine flour and all remaining coffee cake ingredients; mix just until dry ingredients are moistened.
In small bowl, combine 1/2 cup sugar and cinnamon; mix well. Add 1 teaspoon maple flavor; mix well with fork.
Spread half of batter in sprayed pan. Sprinkle with half of topping. Spoon remaining batter over top; spread evenly. Sprinkle with remaining topping.
Bake at 350°F. for 25 to 35 minutes or until toothpick inserted in center comes out clean. Cool 15 minutes. Serve warm.