Breakfast Enchiladas with Chorizo

Ingredients

• 1/2 pound uncooked chorizo or spicy pork sausage
• 1 small onion, finely chopped
• 1/2 medium green pepper, finely chopped
• 2 teaspoons butter
• 6 large eggs, beaten
• 3/4 cup shredded cheddar cheese, divided
• 3/4 cup shredded pepper jack cheese, divided
• 1 can (10 ounces) enchilada sauce
• 8 flour tortillas (6 inches), warmed
• 1 green onion, finely chopped