Buttah Chicken

2 1/2 pounds thawed boneless chicken thighs
1 (28 oz) can crushed tomatoes
1 Tbsp plus 1 tsp garam masala
1 tsp onion powder
2 1/2 tsp salt
1/2 tsp cayenne pepper (optional)
3 Tbsp butter
1 large onion, diced
2 tsp minced garlic
1 (24 1/2 oz) can petite diced tomatoes, drained
1/2 cup sour cream
1/4 cup cream

Place the chicken thighs in the bottom of the crockpot. Blend the crushed tomates with the seasonings and butter, then add to the crockpot. Add the onion, garlic, and the diced tomatoes. Cook on low heat all day or on high heat for 5 - 6 hrs. Just before serveing, break up the chicken with 2 forks, then mix in the yogurt and cream. Serve over rice or Cauli Rice.