Creating Slow Cooker Indian Butter Chicken is straightforward if you follow these steps:

1. Prep Chicken: Begin by cutting the chicken thighs into bite-sized pieces and trimming any excess fat.
2. Blend Spices: In a large mixing bowl, combine the garam masala, coriander, cumin, paprika, turmeric, salt, black pepper, and cayenne.
3. Sauté Onions: In a skillet, melt 2 tablespoons of butter over medium heat. Add the chopped onions and sauté until translucent, about 5-7 minutes.
4. Add Garlic and Ginger: Stir in the minced garlic and grated ginger, cooking for an additional minute until fragrant.
5. Combine Ingredients: Transfer the onion mixture to the slow cooker. Add crushed tomatoes, spices, and the remaining butter.
6. Add Chicken: Toss the chicken pieces in the slow cooker until they are well coated with the sauce.
7. Simmer: Cover the slow cooker and cook on low for 6-8 hours or on high for 3-5 hours, until the chicken is tender and fully cooked.
8. Stir in Cream: Once cooked, stir in the heavy cream (or coconut milk) and let it warm through for another 15 minutes.
9. Adjust Seasoning: Taste and adjust the spices if needed, adding more salt or cayenne for heat.
10. Garnish and Serve: Before serving, sprinkle with freshly chopped cilantro for a pop of color and flavor.

These easy-to-follow steps ensure your dish turns out deliciously creamy and rich.