Slow-Cooker Chicken Tikka Masala Meatballs

Ingredients

• Meatballs
• 1 pound ground chicken
• ½ red onion, minced
• ¼ cup chopped fresh cilantro
• 1 large egg
• 3 garlic cloves, minced
• 1 teaspoon ground cumin
• 1 teaspoon ground coriander
• ¾ teaspoon kosher salt
• ½ teaspoon freshly ground black pepper
• Sauce
• One 28-ounce can crushed tomatoes
• 1 tablespoon unsalted butter
• 1 tablespoon grated ginger
• 1 serrano chili, minced
• 1 tablespoon garam masala
• Kosher salt and freshly ground black pepper
• ¼ cup heavy cream
• Chopped fresh cilantro, as needed for serving
• Greek yogurt, for serving