Name: Heirloom Tomato, Zucchini, Caramelized Onion and Feta Galette
Prep time: 15 min
Cook time: 15 min
Total time: 30 min
Ingredients: 2 yellow onions (peeled and sliced); 1 tablespoon olive oil (plus more for drizzling); 2 tablespoons butter; 2 refrigerator pie crusts (1 box); 1 egg white (beaten); 2 tablespoons Dijon mustard; 2 heirloom tomatoes (sliced); 2 zucchini (thinly sliced); 1/2 cup feta cheese (crumbled); Sprigs of fresh thyme leaves; Kosher salt and freshly ground black pepper