Dripping with gooey cheese, 20 Minute Mini Grilled Cheese Appetizers are a twist on the classic that everyone will love. Make a bunch of these diner-style specials because they disappear fast and your crowd will be clamoring for more!
In a small bowl, mix all of the ingredients for Honey Chili Sauce. Cover and refrigerate until serving.
On a baking sheet or parchment paper, lay out 24 slices of bread. Using a knife, spread a thin layer of mayonnaise over one side of bread then place the bread mayonnaise side down on baking sheet. Divide half of the mayonnaise between 24 slices of bread.
Put a slice of cheddar and a slice of gruyere on each piece of bread. Salt and pepper as needed.
Spread a thin layer of Dijon mustard on one side of each of the remaining 24 slices of bread, then place each bread slice Dijon side down on top of the slices of cheese, making a little sandwich.
Spread the remaining half of the mayonnaise in a thin layer on the top side of each sandwich. Both sides of each sandwich should be spread with mayonnaise.
Heat a large skillet or grill pan over medium heat. Working in batches, add the mini sandwiches and cook until lightly brown, about 3 minutes. Using a spatula, turn the sandwiches over and continue cooking until both sides are golden and the cheese is melted, about another 3 minutes.
Allow the sandwiches to cool slightly, then open sandwich top and place lettuce inside.