1. Heat oven to 350°F. Beat eggs, milk, salt and pepper in medium bowl until blended. Add cheese, zucchini, bell pepper and onion; mix well. Spoon evenly into 12 greased muffin cups, about 1/4 cup each.
2. Bake in 350°F oven until just set, 20 to 22 minutes. Cool on rack 5 minutes. Remove from cups; serve warm.
Note: Muffin frittatas are great as an appetizer as well as for breakfast.
Makes 12 mini frittatas. Serves 6. Nutrition information per serving (2 mini frittatas): 163 calories; 12 g total fat; 6 g saturated fat; 1 g polyunsaturated fat; 4 g monounsaturated fat; 233 mg cholesterol; 294 mg sodium; 3 g carbohydrate; 0 g dietary fiber; 12 g protein; 696.2 IU Vitamin A; 28.5 IU Vitamin D; 35.9 mcg folate; 189.9 mg calcium; 1.1 mg iron; 134.0 mg choline.
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