Mix crab, cream cheese, mayonnaise, onions, lemon juice, salt, pepper, and cayenne in a medium bowl.
Spoon mixture onto 4 slices of bread. Top each with some avocado and sprouts and another slice of bread and cut in half.
Servings 0
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.