2 medium zucchinis, thinly sliced
2 medium yellow squashes, thinly sliced
1 small onion, thinly sliced
2 cloves garlic, minced
1 cup heavy cream
1 cup grated Parmesan cheese
1 cup shredded Gruyere cheese
1/2 cup breadcrumbs
2 tablespoons butter
1 teaspoon fresh thyme leaves
Salt and pepper to taste