
In a bowl, combine mayonnaise, cheese, sweet chili sauce, green onions, and lime juice. Gently stir until incorporated.
Arrange mussels in a single layer on an aluminum foil or parchment-lined baking sheet. Spoon about 1 teaspoon of mayo-chili mixture on each shell and spread to cover the mussel fully.
Bake in a 375 F oven for about 10 to 15 minutes or until golden brown and bubbly. Serve immediately.