This appetizer recipe of mushroom and gruyère crostini is made with sautéed mushrooms cooked in red wine. They're served on a crunchy slice of toasted French bread with melted gruyère.
Slice the baguette into ½" slices diagonally. Lay them flat on a baking sheet. Melt 3 tablespoons butter with garlic salt. Brush the tops of the bread slices with garlic-salted butter. Add gruyère cheese to the top of each bread slice.
Bake the bread slices in the oven for 4-5 minutes until the cheese is melted.
Melt 3 tablespoons of butter in a large skillet over medium-high heat. Add sliced mushrooms and cook 5-7 minutes until they are tender. Add red wine, soy sauce, and thyme. Stir to coat mushrooms and cook an additional 1-2 minutes.
Add sauteed mushrooms on top of the melted cheese on each crostini.