Liz's Slow Cooker Chicken Curry

1 large onion

cut into wedges

3 large skinless

boneless chicken breasts

chopped

¼ cup butter

cut into chunks

5 cloves garlic

chopped

4 carrots

peeled and sliced

5 potatoes

peeled and cubed

1 head cauliflower

separated into florets

4 ½ tablespoons curry powder

2 tablespoons ground turmeric

1 tablespoon red chile flakes

or to taste

½ tablespoon ground ginger

salt and ground black pepper to taste

4 cups chicken stock

or as needed

4 tablespoons all-purpose flour

or as needed