Frittata with California Avocado, Roasted Peppers, Olives and Feta - California Avocados

Ingredients

• 1 1/2 cups onion, chopped
• 1 Tbsp. olive oil
• 24 large eggs
• 2 cups milk
• 2 tsp. dried oregano
• 1 1/2 tsp. salt
• 6 California Avocados
• 2 Tbsp. lemon juice
• 3 cups feta cheese, crumbled
• 1 1/2 cups Kalamata olives, coarsely chopped
• 1 1/3 cups Roasted red bell pepper, coarsely chopped