Slow Cooker Butter Chicken Sliders

butter (or oil, to make this recipe dairy free)

large onion, diced

garlic, crushed

thumb-size pieces of ginger root, peeled and finely grated

garam masala

cumin

turmeric

to 1 teaspoon cayenne (optional; leave out if you have spice-averse kids)

/ 15 oz can full fat coconut milk

small (156 ml / 5 oz) can tomato paste

boneless skinless chicken thighs

cornstarch

whipping cream (optional)

Salt and pepper,

For serving: small slider-sized buns or cooked rice, cilantro, shredded cabbage, mango chutney, sliced cucumber