Vegetarian Pot Pie

Ingredients (15)

• 3 tablespoons unsalted butter
• 10 ounces cremini baby bella mushrooms
• 2 medium stalks celery
• 1 1/2 teaspoons garlic powder
• 1/2 teaspoon kosher salt
• 1/4 teaspoon black pepper
• 1/4 cup all-purpose flour
• 2 cups unsweetened almond milk or milk of choice
• 1 15-ounce can reduced sodium white beans
• 1 12-ounce bag mixed peas and carrots
• 1/2 cup frozen pearl onions
• 1 tablespoon chopped fresh thyme
• 1 tablespoon balsamic vinegar
• 1 prepared pie crust
• 1 egg