• Preheat the oven to 450°F (if using a baking sheet) or 500°F (if using a baking stone/steel) with a rack set in the middle position; if you're using a stone/steel, place it on the oven rack before you start preheating.
• Place the dough on a lightly floured work surface, and cut each ball in half (to make 4 smaller balls total). Cover the dough balls with an upside-down bowl or container while you prep the toppings.

To make the jack-o'-lantern faces (see recipe video)

• If using green bell pepper: On a cutting board, hold the pepper upright by its stem and cut the flesh away from the stem and seeds in wide planks. If the pepper flesh is very thick, lay it flat on your cutting board, skin-side up, and slice it horizontally. Use a sharp paring knife to cut out eyes, a nose, and a funny/scary grin.
• If using kale or cabbage: Bring a medium pot of water to a rolling boil. Fill a large bowl with ice water and place it near the stove. Drop the leaves into the boiling water and blanch them for 1½ to 2 minutes, then grab them with tongs and put them right in the ice water to lock in their bright color. Drain, pat dry, and use a sharp paring knife to cut out eyes, a nose, and a funny/scary grin.
• If using roasted red peppers: Cut a slit down one long side of each pepper, open it like a book, lay it flat on a cutting board, and pat both sides dry with paper towels. Use a sharp paring knife to cut out eyes, a nose, and a funny/scary grin.
• If using pepperoni: Lay the pepperoni slices on a cutting board and use a sharp paring knife to cut out eyes, a nose, and a funny/scary grin.

To bake the pizzas

• Working one at a time, stretch or roll a dough ball into a 6-inch round or oval. (If you're using a large baking sheet, you might be able to fit two at a time.) Use a sharp paring knife to cut a stem into the top of each (as shown in the recipe video below).
• Place one piece of pumpkin-shaped dough on a lightly floured pizza peel (if using a baking stone/steel) or heavy-duty, dark-colored baking sheet or pizza pan (two should fit on a large baking sheet). Top with sauce, cheese, and your jack-o'-lantern face(s). If you're using green bell pepper, roasted red pepper, or kale/cabbage faces, brush the tops of the vegetable shapes with olive oil to prevent them from burning.
• Transfer the pizza(s) to the oven and bake for 12 to 15 minutes (on a baking sheet) or about 8 minutes (on a baking stone/steel), until the bottom is evenly browned and the cheese has browned in spots.
• Repeat with the remaining dough and toppings.