Preheat oven to 375 degrees Fahrenheit and coat a rimmed baking sheet with cooking spray or oil.
In a large bowl mix all ingredients one at a time, mixing well after each addition.
Carefully pour the eggs onto the baking sheet and bake for 10 minutes.
Remove frittata from oven and top with decorative ham.
Bake 10 additional minutes until the frittata is puffed around the edges and a knife inserted in the center comes out clean.
Cool completely before slicing.