Step 1
Preheat oven to 350°F (175°C).

2nd step
Melt the butter in a saucepan. Add onions and mushrooms and sauté until soft.

Step: 3
Add the egg, oregano, salt and pepper and mix for 1 to 2 minutes. Remove from fire.

Step: 4
Slice the baguette into 3/4-inch slices.

Step: 5
Line a baking sheet with a sheet of parchment paper.

Step: 6
Add the mixture to the bread slices. Sprinkle with a little cheese.

Step: 7
Cook for 12 to 15 minutes. If it is not browned to your liking, add 1 minute or 2 to BROIL.