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Keto Pizza Stuffed Mushrooms - A Fast, Flavor-Packed Low-Carb Favorite

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Prep Time 10 minutes
Cook Time 20 minutes
Total Time 30 minutes
Servings: 4 servings
Ingredients Method

Ingredients
  

  • 12 medium cremini or baby portobello mushroom caps, stems removed and gills gently scraped
  • 2 tablespoons olive oil, divided
  • Salt and black pepper, to taste
  • 1 cup shredded mozzarella cheese (low-moisture, part-skim or whole milk)
  • 1/2 cup grated Parmesan cheese
  • 3/4 cup low-sugar marinara or pizza sauce (about 4–6 net carbs per 1/2 cup or less)
  • 1/3 cup mini pepperoni or chopped pepperoni (sugar-free, if possible)
  • 1/4 cup finely chopped green bell pepper (optional)
  • 1/4 cup finely chopped red onion (optional)
  • 1/4 teaspoon red pepper flakes (optional, for heat)
  • 1 teaspoon Italian seasoning or dried oregano
  • Fresh basil, torn, for serving (optional)

Method
 

  1. Prep the oven and pan: Preheat your oven to 400°F (200°C). Line a baking sheet with parchment for easy cleanup.
  2. Clean the mushrooms: Wipe the caps with a damp paper towel. Twist off stems and use a small spoon to scrape out the gills if using larger caps. This creates more room for filling and reduces excess moisture.
  3. Season and pre-bake: Place the caps hollow-side up on the baking sheet. Brush with 1 tablespoon olive oil and sprinkle with salt and pepper. Bake for 8–10 minutes until they release some liquid. Carefully drain off any moisture from the pan.
  4. Make the filling: In a bowl, mix the marinara, Italian seasoning, red pepper flakes (if using), and half the Parmesan. Taste and adjust salt if needed.
  5. Assemble: Spoon a little sauce into each cap—just enough to lightly coat the bottom. Add a layer of mozzarella, then scatter pepperoni, peppers, and onion. Top with remaining mozzarella and the rest of the Parmesan. Drizzle with the remaining 1 tablespoon olive oil.
  6. Bake: Return to the oven for 10–12 minutes, or until the cheese is melted and golden around the edges. For extra browning, broil for 1–2 minutes, watching closely.
  7. Finish and serve: Let the mushrooms rest 3–5 minutes to set. Top with torn basil and a crack of black pepper. Serve warm.