In a large bowl, combine the first six ingredients. Combine egg, milk and butter, stir into dry ingredients until just moist. Fold in raspberries and lemon peel. Coat muffin cups with nonstick spray or use paper liners, fill 3/4 full with batter.
Combine topping Ingredients, sprinkle about 1 tablespoon over each muffin. Bake at 350 for18-22 minutes or until toothpick comes out clean. Cool for 5 minutes before removing from pan to wire rack. Combine glaze ingredients, drizzle over warm muffins. Serve