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Add tomato sauce and 1/2 each of garam masala, cumin, curry powder, and turmeric to the crock pot and stir to combine. Set remaining spices aside.
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Add garlic, onion, butter, and chicken, and stir so the chicken is covered in the sauce.
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Cover and cook on high 4 hours or low 6-8 hours.
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In the last 20 minutes or so of cooking, stir in the remaining spices, cream, and salt & pepper to taste.