Preheat the oven to 400°F (200°C). Line a baking sheet with parchment paper.

Prep the mushrooms:
Gently clean each mushroom with a damp paper towel. Use a spoon to scrape out the dark gills. Place mushrooms gill-side up on the baking sheet.

First bake (to remove moisture):
Drizzle with olive oil, sprinkle with salt and pepper, and bake for 5–7 minutes.
When done, carefully tilt each mushroom to drain excess liquid and pat the inside dry with a paper towel.

Assemble the pizzas:

• Spoon a thin layer of marinara into each cap.

• Add a generous handful of mozzarella.

• Top with pepperoni, olives, and bell peppers (or any toppings you love).

Bake again:
Return to the oven and bake for 10–12 minutes, or until the cheese is melted, bubbly, and lightly golden.

Rest before serving:
Let the pizzas cool for 3–5 minutes to help them set and make them easier to pick up.