Cheesy Vegetable Chowder

Name: Cheesy Vegetable Chowder
Ingredients: 1 medium onion, chopped; 5 celery ribs, sliced; 3 carrots, sliced; 1 large potato, cut into 1/4-inch cubes; 1 clove garlic, minced; 3 1⁄2 cups chicken broth; 1 (14 1/2 ounce) can whole kernel corn, rinsed and drained; 1⁄4 cup butter or 1⁄4 cup margarine; 1⁄4 cup all-purpose flour; 2 cups milk; 1 (16 ounce) loaf processed cheese, cubed; 1 (2 ounce) jardiced pimientos, undrained; 1 tablespoon prepared mustard; 1⁄4 teaspoon pepper; 1⁄8 teaspoon paprika; Garnish; celery leaves