Squash Tian

Prep time: 15 minutes
Cook time: 45 minutes
Total time: 60 minutes
Yield: Serves 6

3 tablespoons olive oil
1 medium onion, chopped
2 to 3 large garlic cloves, to taste, minced
2 pounds summer squash, cut in 1/4- to 1/2-inch dice
Salt and freshly ground pepper
2 teaspoons fresh thyme leaves, or 1 teaspoon crumbled dried thyme
1/2 cup Arborio rice, cooked
2 eggs
3 ounces Gruyère cheese, grated (3/4 cup)
1/4 cup breadcrumbs (fresh or dry)