Butter Chicken Meatballs

Name: Butter Chicken Meatballs
Ingredients: 1 large egg; Kosher salt and pepper; 1/3 c. panko; 1 c. cilantro leaves, chopped, plus cilantro sprigs for serving plus cilantro sprigs for serving; 1 tbsp. plus 1 tsp grated fresh ginger, divided fresh ginger, divided; 3 cloves garlic, grated, divided; 1 lb. ground chicken breast; 3 tbsp. unsalted butter, divided; 1 tbsp. olive oil; 1 medium onion, chopped; 1 tbsp. garam masala; 1/2 tsp. ground cumin; 1/8 tsp. cayenne pepper; 2 tbsp. tomato paste; 1 29-oz can tomato puree; 1 tsp. honey; 3/4 c. heavy cream; Basmati rice and naan, for serving