Slow-cooker Mexican casserole

Name: Slow-cooker Mexican casserole
Prep time: 5 min
Total time: 5 min
Cuisine: Mexican, Latin American, American
Ingredients: 1 large onion (finely diced (or 1 cup of frozen pre-chopped onion)); 2 chicken breasts; 1 tin black beans (drained); 1 red pepper (1 green pepper, deseeded and diced); 1 cup frozen sweetcorn; 1 tin chopped tomatoes (refill with water, and also add 1 tin of water); 1 cup uncooked quinoa; Juice of 1 lime; 1 tsp garlic granules; 1 tsp paprika; 1 tsp oregano; 1 tsp cumin; 1/2 cup pickled jalapenos (roughly chopped); salt & pepper; Low calorie cooking spray (or spray oil if you prefer); Coriander to serve