Place oats and cereal in a bowl; cover with boiling water. Let stand for 5 minutes. In a large bowl, combine the flour, sugars, baking soda, and salt. In another bowl, combine the eggs, buttermilk, butter and oat mixture. Stir into dry ingredients just until moistened.
Fill greased muffin cups two-thirds full. Bake at 375° for 18-20 minutes or until a toothpick comes out clean. Cool for 5 minutes before removing from pans to wire racks. Serve warm.