Tuna Melt with Avocado on English Muffins

Name: Tuna Melt with Avocado on English Muffins
Prep time: 15 min
Cook time: 5 min
Total time: 20 min
Yield: 4 serving(s)
Ingredients: 1 (12 1/2 ounce) can water-packed albacore tuna, drained and flaked; 1/2 cup Italian dressing or 1/2 cup simple vinaigrette; 1 cup celery, chopped; 1/2 cup green onion, thinly sliced; 1/2 cup green bell pepper, chopped; 4 English muffins, split and toasted; 2 avocados, cut crosswise into 1/2 inch thick slices; 1 1/2 cups fontina or 1 1/2 cups swiss cheese, shredded