Lazy Daisy Oatmeal Cake Recipe

Pour boiling water over oats in medium bowl; mix well.
In large bowl, beat margarine and sugars until well blended. Add egg whites and vanilla; beat well. Add oat mixture and combined flour, baking soda, cinnamon, nutmeg and, if desired, salt; mix well.
Pour batter into pan.
Bake until wooden pick inserted in center comes out clean.
Transfer cake in pan to wire rack.
For topping, combine all ingredients in small bowl; mix well.
Spread evenly over top of warm cake.
Broil about 4-inches from heat 1 to 2 minutes or until topping is bubbly.
Watch closely; topping burns easily.
Cool cake in pan on wire rack. Store tightly covered at room temperature.