Mediterranean Frittata - Ohio Eggs

Ingredients

• 12 eggs
• 3 tablespoons whole milk (or cream)
• 2 tablespoons harissa paste
• 2 tablespoons olive oil
• 1/4 cup red onion, diced
• 1/2 cup red bell pepper, seeds removed, diced
• 1/2 cup matchstick carrots, chopped
• 1 cup fresh spinach, roughly chopped
• 1 cup (4 ounces) feta cheese, crumbled, divided
• 1/2 teaspoon salt
• 1/8 teaspoon black pepper