Heat olive oil in a 10-inch nonstick broiler-proof skillet over medium heat. Add zucchini, bell pepper, onion, thyme, 1/4 teaspoon salt, 1/8 teaspoon black pepper, and garlic. Cover and cook 7 minutes or until vegetables are tender, stirring occasionally. Stir in tomato. Cook, uncovered, for 5 minutes or until liquid evaporates.
Combine eggs, remaining 1/4 teaspoon salt, and remaining 1/8 teaspoon black pepper in a medium bowl; stir with a whisk until frothy. Pour egg mixture into pan over vegetables, stirring gently. Cover, reduce heat, and cook 15 minutes or until almost set in the center.
Broil frittata 3 minutes or until set. Invert onto a serving platter; cut into 8 wedges.
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