Creating delicious Crockpot Butter Chicken is simple when following these steps:

1. Prepare the Chicken: Place the boneless, skinless chicken thighs in the bottom of the Crockpot.
2. Add Aromatics: Scatter the diced onion, minced garlic, and grated ginger over the chicken.
3. Mix the Sauce: In a bowl, combine the crushed tomatoes, heavy cream (or coconut milk), butter, garam masala, cumin, paprika, turmeric, cayenne pepper, salt, and pepper. Stir well to mix.
4. Combine Ingredients: Pour the sauce mixture over the chicken and onions in the Crockpot, ensuring the chicken is well coated.
5. Cook: Cover the Crockpot and set it to cook on low for 6 to 8 hours or on high for 3 to 4 hours.
6. Shred the Chicken: About 30 minutes before serving, shred the chicken using two forks and stir it back into the sauce.
7. Adjust Seasoning: Taste the sauce and adjust the seasoning if needed, adding more salt, pepper, or spices as desired.
8. Garnish: Before serving, sprinkle with fresh cilantro for a burst of color and flavor.

These steps will guide you effortlessly through the process of making this incredible dish.