Preheat the oven to 400 degrees.
Heat the olive oil in an ovenproof pan over medium heat. Add the onion and cook until translucent, around 5 minutes.
2 Tbsp olive oil, ½ onion
Add the mushrooms and cook until golden brown, around 2 minutes per side.
1 Pound mushrooms
Add the fresh gnocchi, salt and Italian seasoning and stir to combine, cook for 2 more minutes or until the gnocchi is coated in the olive oil.
2 Pounds fresh gnocchi, 1 Tsp salt, 1 ½ Tsp Italian seasoning
Stir in the pasta sauce and remove from heat. Top with the fresh mozzarella slices and take to the oven.
1 jar pasta sauce, 8 oz fresh mozzarella cheese
Bake for 25 minutes or until the cheese is fully melted and bubbly. Serve topped with parmesan cheese and cracked fresh pepper.