Wash the whole green zucchini thoroughly, then place them horizontally on your cutting board. Use a sharp chef knife to trim away both woody ends cleanly. Slice the zucchini crosswise into even rounds that measure exactly one-half inch thick. Keep your cuts steady so every single slice is uniform in size. (I tried slicing them thinner the first time, they turned into absolute mush in the oven. This half-inch thickness is the goldilocks size for a sturdy base.) You should see a ring of dark green skin surrounding a crisp pale green center. Line up twenty slices across a large rimmed baking sheet pan lined with parchment paper. Leave a half-inch of natural spacing between each round so they roast instead of steaming. Arrange them loosely without overlapping, the space lets hot air circulate evenly to dry the surface.

Slide the baking sheet pan into the middle rack of your 400°F preheated oven. Bake the bare slices for exactly 8 minutes without moving them. This initial high-heat blast draws out excess water from the vegetable structure before you add any wet toppings. Look for the bright white centers to turn slightly translucent and matte. You'll smell a mild roasted squash aroma right when they finish this first cook. Miss this window and your final pizza bites will release juice and turn incredibly watery during the cheese melting stage. Remove the pan carefully using oven mitts and place it on a heat-safe surface. The rounds will look slightly shrunken but their edges will remain firm. Bake at 400°F for 8 minutes, par-baking prevents a soggy bottom later.

Measure out one teaspoon of smooth red pizza sauce for each warm zucchini round. Use a small metal spoon to drop the sauce directly into the exact center of each slice. Gently swirl the back of the spoon in a small circular motion to spread the sauce. Leave a thin border of green skin visible around the edge so the sauce doesn't spill over. The red sauce will sit cleanly on top of the pale zucchini centers. It should look glossy and thick without running down the sides of the rounds. Work efficiently while the zucchini bases are still hot from the oven. (My first batch leaked everywhere because I used regular pasta sauce, stick to thick pizza sauce for the best hold.) Spoon one teaspoon per round, controlled layering keeps the base perfectly crisp.

Pinch a small mound of shredded mozzarella cheese and place it unevenly over the red sauce. Use about one tablespoon of cheese per slice so it covers the sauce completely. The white shreds will pile up loosely and stick to the wet sauce layer underneath. Press two mini pepperoni slices gently into the cheese mound on each round. The pepperoni should sit slightly askew with natural spacing rather than perfectly centered. Sprinkle a tiny pinch of green dried oregano over the entire tray from high above for an even distribution. Ensure no cheese falls directly onto the parchment paper where it might burn. If you prefer a completely different later, you can swap things up just like we do with our Homemade Hot Dogs when the kids want extra toppings. Layer toppings quickly within 2 minutes, rapid assembly preserves the residual heat for melting.

Return the fully assembled tray to the middle oven rack at 400°F. Bake for exactly 5 minutes until the shredded cheese completely melts into a solid layer. Switch your oven setting to high broil for the final 60 seconds to finish the toppings. You'll hear the cheese sizzling loudly and see small bubbles forming across the surface. The white cheese will develop beautiful deep golden-brown toasted spots while the pepperoni edges crisp and curl upward. Go past 90 seconds on broil and the cheese turns bitter and black. Pull the baking sheet pan out immediately when the top looks blistered and glossy. Let the finished bites rest on the hot pan for 2 minutes before moving them. Broil for 60 seconds at the end, intense direct heat creates that classic charred pizzeria texture.