Spinach Feta Quiche with Quinoa Crust

Ingredients

• 2 cups cooked quinoa, chilled
• 1/8 teaspoon freshly ground black pepper
• 1 large egg, beaten
• Cooking spray
• 1 teaspoon coconut oil
• 1/2 onion, thinly sliced
• 1 (5-ounce) bag baby spinach
• 1/2 cup 1% low-fat milk
• 1/2 teaspoon kosher salt
• 1/4 teaspoon freshly ground black pepper
• 1/4 teaspoon crushed red pepper
• 4 large eggs
• 2 large egg whites
• 1 1/2 ounces feta cheese, crumbled