Maple Oatmeal Princess Coffee Cake

Name: Maple Oatmeal Princess Coffee Cake
Ingredients: 1/2 cup old-fashioned rolled oats; 2/3 cups boiling water; 3/4 cups all-purpose flour; 3/4 teaspoons ground mace or freshly grated nutmeg; 1/2 teaspoon baking soda; 1/2 teaspoon baking powder; 1/4 teaspoon salt; 1/4 cup unsalted butter, softened; 1/2 cup packed light brown sugar; 1 large egg; 1/3 cup maple syrup (grade B or dark amber grade A); 1/2 teaspoon vanilla extract; 1/4 cup unsalted butter; 1/2 cup sweetened shredded coconut, lightly packed; 1/3 cup chopped toasted pecans; 2 tablespoons créme fraîche or sour cream