Step 1: Prep the Mushrooms

Preheat your oven to 400°F (200°C). Line a large baking sheet with parchment paper or aluminum foil. Clean the mushrooms by wiping them with a damp paper towel (don’t soak them or they’ll become waterlogged). Remove the stems by gently twisting them off—save stems for another use or chop finely to add to the filling. Using a small spoon or melon baller, gently scrape out the gills from each mushroom cap to create more space for filling. This step is optional but gives you room for more delicious filling!

Step 2: Season the Mushroom Caps

Brush the outside of each mushroom cap lightly with olive oil. This helps them cook properly and prevents drying out. Season the inside of each cap with a pinch of salt and pepper. Arrange the prepared mushroom caps on your lined baking sheet, cavity side up, ready to be filled.

Step 3: Cook the Sausage

Heat a large skillet over medium-high heat. Add the Italian sausage, breaking it up with a spatula or wooden spoon into small crumbles. Cook for 5-7 minutes until browned and cooked through, stirring occasionally. If there’s excess grease (more than a tablespoon), drain most of it off, leaving just a bit for flavor. Add the minced garlic and cook for another 30 seconds until fragrant. Remove from heat.

Step 4: Make the Filling

To the cooked sausage in the skillet, add the softened cream cheese, marinara sauce, half the mozzarella (½ cup), Parmesan cheese, chopped pepperoni, Italian seasoning, and red pepper flakes if using. Stir everything together over low heat until the cream cheese melts and everything is well combined. The mixture should be creamy and cohesive. Taste and adjust seasonings—add more Italian seasoning or garlic if desired. Remove from heat and let cool slightly for easier handling.

Step 5: Stuff the Mushrooms

Using a small spoon or cookie scoop, generously fill each mushroom cap with the sausage and cheese mixture. Pack it in well and mound it slightly—don’t be shy with the filling! The mushrooms will shrink slightly as they cook, so generous filling is good. You want each mushroom to be loaded with that delicious pizza filling.

Step 6: Top with Cheese

Sprinkle the remaining ½ cup of mozzarella cheese over the tops of all the stuffed mushrooms. This creates that beautiful melted, golden cheese topping that makes them irresistible. You can also add a few extra mini pepperoni on top of each for visual appeal and extra pizza flavor!

Step 7: Bake

Place the baking sheet in your preheated 400°F oven and bake for 15-18 minutes, until the mushrooms are tender, the filling is hot and bubbling, and the cheese on top is melted and starting to turn golden brown. If you want extra golden cheese, turn on the broiler for the last 1-2 minutes, watching carefully so they don’t burn.

Step 8: Garnish and Serve

Remove from the oven and let cool for 2-3 minutes—they’ll be very hot! Garnish with fresh chopped basil, extra Parmesan cheese, or a sprinkle of red pepper flakes if desired. Transfer to a serving platter and serve warm. Watch them disappear!