Easy Crockpot Butter Chicken

Ingredients

• 1 ½ lbs boneless, skinless chicken thighs
• 1 cup canned tomato puree
• ½ cup unsalted butter, cut into cubes
• 1 medium onion, finely chopped
• 4 cloves garlic, minced
• 1 tablespoon fresh ginger, grated
• 2 teaspoons garam masala
• 1 teaspoon ground cumin
• 1 teaspoon paprika
• ½ teaspoon turmeric
• ½ teaspoon cayenne pepper (adjust to taste)
• 1 teaspoon salt (more to taste)
• ½ cup heavy cream
• Fresh cilantro for garnish (optional)