Chicken Tamale Pie

Name: Chicken Tamale Pie
Ingredients: For the chili; 1 pound skinless chicken breast, cubed; 1 clove garlic, minced; 1 teaspoon coriander; 1 teaspoon chili powder; 1 teaspoon cumin; 3 tablespoons olive oil; 1 cup chopped onion; 2 cans beans, drained and rinsed (I used one black, one Great Northern); 1 can sweet corn, drained and rinsed; 1 (4-ounce) can hot green chilies; 1 (12-ounce) can diced tomatoes in juice; 1/4 cup chicken stock (optional); For the topping; 3/4 cup cornmeal; 1/2 teaspoon salt; 2 cups water; 1 tablespoon butter