Preheat oven to 400°F. Line the cups of a standard muffin tin with paper baking liners, or mist with nonstick cooking spray. In a large bowl, whisk together flour, sugar, baking powder, salt, lemon peel, and nutmeg. Stir in nuts and raisins.
In a medium-size bowl, beat eggs; then beat in milk and oil. Add to flour mixture; then sprinkle zucchini on top. Stir until just blended. Fill muffin tins. Bake until tops are golden brown and a toothpick comes out clean, 20–24 minutes.