4 tablespoons butter
3 cloves garlic, minced
1 tablespoon ginger, minced
1 medium onion, diced
4 (about 2 pounds) boneless, skinless chicken breasts or thighs
2 tablespoons garam masala
1 teaspoon tumeric
1 teaspoon kosher salt
1/2 teaspoon cayenne pepper
1 1/2 cups tomato sauce
1 cup heavy cream or half-and-half
1/2 cup plain Greek yogurt
Fresh cilantro, for garnish
Cooked rice, for serving