Low Carb Frittata with Ham and Cheese

Ingredients (for 2 servings)

• 1 tbsp — salted butter
• ¾ cup — yellow onion
• 1 cup — diced ham
• 12 whole — eggs
• ¼ cup — whole milk
• ¼ tsp — black pepper
• ¼ tsp — salt
• 1 cup — shredded cheddar cheese
• 1 tbsp — fresh chives