1/2 c. grated Swiss cheese
1/2 c. sliced canned mushrooms
1 tbsp. chopped onions
1/2 c. cooked shrimp, crab or tuna
1/4 c. mayonnaise
2 English muffins, split

Combine first 5 ingredients and stir until blended. Spread over English muffins.

Bake 10 minutes in a 400°F oven, then broil until bubbly.