Vegetarian Whole Stuffed Cabbage

Name: Vegetarian Whole Stuffed Cabbage
Ingredients: 5 tablespoons olive oil; Kosher salt and freshly ground black pepper; 1 pound savoy cabbage leaves (10 to 12 leaves from 1 small head); 3 cloves garlic; 1 stalk celery, roughly chopped into 1-inch pieces; 1 medium carrot, roughly chopped into 1-inch pieces; 1 small red onion, roughly chopped into 1-inch pieces; 1 tablespoon fresh thyme, finely chopped; 1 teaspoon paprika; 1/4 teaspoon crushed red pepper flakes; 1 pound cremini mushrooms, quartered; 1 pound shiitake mushrooms, stems removed, quartered; 3/4 cup brown rice; 2 tablespoons fresh parsley, finely chopped; 2 large eggs, lightly beaten; 2 1/2 cups marinara sauce