Chicken Tortilla with garlic

1/2 large purple onion , finely chopped 2 garlic cloves , minced 1 tablespoon butter or 1 tablespoon margarine 1 (15 ounce) can cream-style corn 1 (14 1/2[...]

3 cloves garlic, minced 1 onion, chopped 3 tablespoons margarine 2 tablespoons all-purpose flour 3 (14 ounce) cans chicken broth 4 cups half-and-half 1 (10.75[...]