Marinade
1 cup plain yogurt
2 tablespoons lemon juice
2 teaspoons cumin
2 teaspoons cinnamon
1 teaspoon red pepper flakes
1 teaspoon salt
1 teaspoon grated fresh ginger
1 1/2 pounds boneless, skinless chicken breast cut into strips or large cubes

Sauce
1 tablespoon butter
2 tablespoons flour
2 cloves garlic, minced
1 jalapeño chili, minced
2 teaspoons ground coriander
1 teaspoon cumin
1 teaspoon paprika
1 teaspoon garam masala
1/2 teaspoon salt
1 8 oz. can tomato sauce
1 1/2 cups half-and-half
1/2 cup chopped cilantro