Air-Fryer White Bean and Mushroom Gratin

Ingredients

• 8 ounces cremini mushrooms, trimmed and sliced ½ inch thick
• 1 large shallot, sliced thin
• 2 tablespoons extra-virgin olive oil, divided, plus extra for drizzling
• 1 tablespoon tomato paste
• 1½ teaspoons all-purpose flour
• 1 (15-ounce) can cannellini beans or great northern beans, undrained
• 1 small zucchini, cut into ½-inch pieces
• 2 tablespoons water
• 1 teaspoon soy sauce
• 1 teaspoon minced fresh thyme or ¼ teaspoon dried
• ¼ teaspoon ground black pepper
• 1 slice rustic whole-grain bread, cut into ½-inch pieces (1 cup)
• 1 tablespoon minced fresh parsley