Mushroom & Egg Frittata Bites Recipe - Rusty Hinges Ranch, Petaluma

Ingredients

• 1 tsp olive oil
• 1/2 cup red onion, chopped
• 8 oz crimini mushrooms, chopped
• 1/4 cup shredded cheese blend
• 9 large eggs
• 1/3 cup milk (any kind will work)
• 1/2 tsp sea salt
• Freshly ground black pepper, to taste