Ingredients

• 1 tablespoon unsalted butter

• 1 tablespoon vegetable oil

• 1 ¼ cups boneless, skinless chicken thighs

• 1 teaspoon kosher salt, or more to taste

• 1 tablespoon curry powder

• 1 teaspoon garam masala

• ½ teaspoon ground cumin

• ½ teaspoon freshly ground black pepper

• ¼ teaspoon ground mustard

• ¼ teaspoon ground coriander

• ¼ teaspoon cayenne pepper

• 4 cloves garlic, minced

• 1 tablespoon finely grated fresh ginger

• 1 large yellow onion, diced

• 2 carrots, diced

• 2 stalks celery, diced

• 1 tablespoon tomato paste

• 1 cup cubed Yukon Gold potatoes

• ½ cup seeded and diced tomato

• 2 small Granny Smith apples - peeled, cored, and diced

• ½ cup dry red lentils

• 1 bay leaf

• 1 teaspoon tamarind paste

• 6 cups chicken broth

• 3 tablespoons coconut cream (Optional)

• ½ cup plain Greek yogurt, or to taste

• ¼ cup chopped fresh cilantro, or to taste

• ¼ cup sliced green onion, or to taste

• 1 pinch red pepper flakes, or to taste