A frittata is a very versatile recipe. You can serve it at any meal and you can also vary the meat, vegetables, cheese and seasonings.
Heat oil in large ovenproof nonstick skillet on medium heat. Add onion and zucchini; cook and stir 2 minutes. Reduce heat to medium-low. Add ham; cook 2 minutes.
Beat eggs, milk, Italian seasoning, salt and pepper in medium bowl. Pour into skillet. Cook without stirring 5 minutes or until eggs are set on bottom. Arrange sliced tomatoes on top of egg mixture. Sprinkle with cheese.
Broil 4 to 5 minutes until eggs are set and cheese is lightly browned. Sprinkle with additional Italian seasoning, if desired.
Test Kitchen Tip: Wrap the skillet handle in foil if your skillet is not ovenproof.