To prepare cake, combine oats and 1 cup hot water in a small bowl; set aside.
Lightly spoon flour into dry measuring cups; level with a knife. Combine flour, 2 teaspoons cinnamon, baking soda, and salt. Combine 1 1/3 cups sugar, applesauce, 1/3 cup honey, and eggs in a large bowl; beat with a mixer at high speed 1 minute. Add oat mixture; beat at low speed until well blended. Add half of flour mixture to sugar mixture; beat well. Add remaining flour mixture; beat well. Spoon batter into an 11 x 7–inch baking dish coated with cooking spray. Bake at 350° for 48 minutes or until a wooden pick inserted in center comes out clean. Place dish on a wire rack.
Broil cake 1 minute or until frosting is bubbly and golden. Cool completely on a wire rack. Serve with whipped topping; sprinkle with ground cinnamon, if desired.
16 servings (serving size: 1 cake piece and 1 tablespoon topping)
CALORIES 255(19% from fat); FAT 5.4g (sat 2.1g,mono 1.7g,poly 0.5g); PROTEIN 3.4g; CHOLESTEROL 34mg; CALCIUM 40mg; SODIUM 193mg; FIBER 1.5g; IRON 1.8mg; CARBOHYDRATE 48.9g