INGREDIENTS
1
Red onion, large
1/2 tsp
Thyme
4
Tomatoes, medium
2
Zucchini (1 pound), medium
1/2 cup
Chicken broth, low-sodium
1
Salt and freshly ground pepper
1/4 cup
Olive oil, extra-virgin
1
baguette, cut into 1/4-inch-thick slices
1/2 cup
Gruyere cheese
1/4 cup
Heavy cream
1/4 cup
Parmigiano-reggiano cheese