Prep the oven and pan: Preheat your oven to 425°F (220°C). Line a baking sheet with parchment paper for easy cleanup and better browning.
Slice the zucchini: Cut zucchini into 1/4-inch thick rounds.
Aim for uniform thickness so they roast evenly.
Season and oil: Place slices in a single layer on the baking sheet. Brush or toss with olive oil, then sprinkle with salt, pepper, garlic powder, and Italian seasoning.
Roast the bases: Bake for 8–10 minutes, until the tops look slightly dry and the edges just begin to brown. This step prevents soggy bites.
Pat off moisture: Remove the pan and gently blot the tops of the zucchini with a paper towel to absorb any excess moisture.
Add sauce and cheese: Spoon a small dollop of sugar-free marinara onto each slice.
Top with mozzarella, then a light sprinkle of Parmesan.
Top it off: Add mini pepperoni or your chosen toppings. Keep them small so they cook quickly and don’t slide off.
Back to the oven: Return the pan to the oven and bake for 5–7 minutes, until the cheese is melted and bubbly.
Optional broil: For extra browning, broil for 1–2 minutes, watching closely to avoid burning.
Finish and serve: Let the bites rest for 2 minutes to set the cheese. Sprinkle with red pepper flakes and fresh basil if you like.
Serve warm.