In a medium bowl, combine the salmon, crushed crackers, creole seasoning, chopped onion, and the egg.
In a large skillet, heat the olive oil over medium heat. When the oil is hot, form the salmon mixture into three patties. Cook them in the oil for about 3 minutes per side, until it looks crisp on both sides.
As salmon patties are cooking, toast your English muffins. Load up each English muffin with a cooked salmon patty and 1/3 of the avocado. Enjoy!
Nutrition facts (approximate per sandwich; recipe makes 3 sandwiches): 343 calories, 15 g fat, 600 mg sodium, 37 g carbohydrate, 6.5 g fiber, 3.5 g sugar, 16 g protein, Vitamin D: 37%, Calcium: 12%, Iron: 20%, Potassium: 14%