Step 1

Gather all your ingredients and preheat your oven to 350 degrees.

Step 2

Slice baguette into 3/4 inch slices. Set aside.

Step 3

In a large skillet melt your butter and add the mushrooms to the skillet.

Step 4

Add onions and continue cooking until tender.

Step 5

Add oregano, salt and pepper to the skillet.

Step 6

Next, add mozzarella cheese and parmesan cheese.

Step 7

Add the egg and stir for a minute until totally blended.

Step 8

Remove the skillet from the heat.

Step 9

Prepare rimmed baking sheet with parchment paper.

Step 10

Place slices on baking sheet and add mushroom mixture on top of each slice. Add a pinch of shredded mozzarella cheese on top of each.

Step 11

Drizzle with olive oil if desired.

Step 12

Bake for between 12-15 minutes. The cheese should be melted and mushroom mixture heated through.

Step 13

Serve up while warm and enjoy every bite!