1. Preheat oven to 350°.
2. 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.
3. 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.
4. Combine 1/4 teaspoon salt and cherry tomatoes. Slice tart; serve with cherry tomatoes.