Gather and prepare ingredients. Preheat oven to 375F.
Slice French bread horizontally into ½” discs, lining them on a baking sheet. Lightly coat them with olive oil and bake for about 10 minutes, until toasted and light golden brown. Remove from oven and set aside.
Bring a large pot of water to a boil. Cook ravioli per instructions, about 3 minutes. Remove from water and set aside.
Heat a sauté pan on medium heat and break up the ground sausage. Once sausage starts to cook and turn color, add the shallot, garlic, and broccoli rabe. Continue cooking until broccoli is tender and all the sausage is cooked through.
Remove the mixture from the heat and transfer to a large bowl and allow to cool.
Once the mixture has cooled, add in breadcrumbs (save 0.25 cup for garnish), cheeses, dry herbs and 1 egg. Mix well until all is evenly combined and held together. Season with salt & pepper.
To assemble, place 1 piece of bread down and place a ravioli on top. Then scoop about 1 TBSP worth of the sausage mixture on top of the ravioli. Repeat this process for remaining bread and ravioli.
Once finished sprinkle remaining breadcrumbs on top. Return the baking sheet with assembled mushroom bites to oven and allow to bake another 5-10 minutes until the breading on top starts to toast the topping is bubbly.
Plate and top with parsley and additional parmesan cheese.