Oatmeal Snack Cake With Broiled Icing

Name: Oatmeal Snack Cake With Broiled Icing
Ingredients: 1 cup quick cooking oats; 3/4 cup water, room temperature; 3/4 cup unbleached all-purpose flour; 1/2 teaspoon baking soda; 1/2 teaspoon baking powder; 1/2 teaspoon salt; 1/4 teaspoon ground cinnamon; 1/8 teaspoon nutmeg; 4 tablespoons unsalted butter, softened; 1/4 cup granulated sugar; 1/2 cup light brown sugar; 1 large egg, room temperature; 1/2 teaspoon vanilla extract; 1/4 cup packed light brown sugar; 3 tablespoons unsalted butter, melted and cooled; 3 tablespoons milk; 3/4 cup sweetened, shredded coconut; 1/2 cup chopped pecans (optional)