Combine melted butter, milk, egg & 2/3 cup oats. Let stand 10 minutes. Combine flour, sugar, baking powder, salt & cinnamon. Stir wet ingredients into dry ingredients just until combined. Fold in raisins. Spoon batter into 12 greased muffin cups, filling each about 3/4 full. Combine streusel ingredients & sprinkle over muffins. Bake at 400 F for 20 - 22 minutes. Per muffin: 178.8 cal, 4.4 g fat (22.5%), 1 mg chol