Spicy Caramelized Onion, Black Bean and Cheddar Frittata

Preheat oven to 350ºF.

Over medium-low heat, add olive oil into a 10″ cast iron skillet. Add sliced onions and stir to coat in oil.

Cook onions for about 20 minutes, checking every 5 to 10 minutes, stirring and scraping up any gunk that forms on bottom of skillet.

Meanwhile, whisk eggs, milk, and grated cheddar in a medium bowl. Season with salt and pepper, to taste. Set aside.

When onions are caramelized, add in garlic and cook for about 1 minute. Add black beans and diced jalapeño to skillet and cook all liquid off, about 3 minutes.

With the heat turned to low, add egg mixture and cook for about 3 minutes, stirring only once at the beginning to evenly disperse ingredients. Sprinkle top of frittata with more grated cheddar.

Transfer skillet to oven and cook until middle is set solid, about 20 minutes. Turn broiler up to high, and broil for about 3 minutes or until top of frittata is golden brown.

Serve warm, and garnish with avocado and salsa.