1. Preheat oven to 350°.
2. To prepare cake, combine oats and 1 cup hot water in a small bowl; set aside.
3. 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.
4. To prepare frosting, melt butter in a small heavy saucepan over medium heat. Add 1/3 cup sugar and 1/4 cup honey; cook 2 minutes or until bubbly, stirring constantly. Stir in almonds. Quickly pour frosting over cake; spread evenly using a rubber spatula.
5. Preheat broiler.
6. 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.