Preheat oven to 350°
Roll dough to a 12-inch circle; press into a 9-inch deep-dish tart or springform pan coated with cooking spray. Sprinkle with fontina, olives, and shallots.
Arrange half of tomato slices over shallots Combine flour, cornmeal, and thyme; sprinkle over tomatoes.
Top with remaining tomato slices; sprinkle with 3/4 teaspoon salt and pepper.
Combine milk, Parmigiano-Reggiano, and eggs; pour into pan.
Bake at 350° for 40 minutes or until set; let stand 10 minutes.
Top with basil.
Combine 1/4 teaspoon salt and cherry tomatoes.
Slice tart; serve with cherry tomatoes.