If using cottage cheese, blend 200g cottage cheese with 15g milk until completely smooth before measuring. If using Greek yogurt, measure straight from the container. Either way you want a thick smooth consistency.
In the bowl of your stand mixer fitted with the dough hook, combine the bread flour and salt and mix briefly on low to distribute. In a separate bowl whisk together the starter, Greek yogurt or blended cottage cheese, water, olive oil, and sugar until smooth, then pour the wet ingredients into the flour.
Mix on low speed until a shaggy dough forms, about 2 minutes, then increase to medium speed and knead for 6 to 8 minutes until the dough is smooth, pulls away cleanly from the sides of the bowl, and passes a partial windowpane test. Because this is an enriched dough you will not achieve a full translucent windowpane. You are looking for a partial windowpane where the dough stretches without immediately tearing. The dough should be tacky but not sticky. If it sticks to the bowl after 3 minutes, add flour one tablespoon at a time. If it looks too stiff, add water one tablespoon at a time.
Transfer the dough to a lightly oiled bowl and cover. After 30 minutes perform one set of stretch and folds by grabbing one side of the dough, stretching it up without tearing, and folding it over the center. Rotate 90 degrees and repeat four times around the bowl.
Cover the bowl and bulk ferment at room temperature for 6 to 8 hours until the dough is 50 to 75% larger, looks domed, and feels airy when you press it. Do not bulk ferment overnight at room temperature as over fermentation breaks down the gluten structure and causes tearing when you shape.
Once bulk fermentation is complete, cover the bowl tightly and place in the refrigerator while your oven preheats.
To long ferment, cover the bowl tightly and refrigerate overnight or up to 24 hours. The cold ferment deepens the flavor significantly and gives you a much more extensible dough that shapes beautifully the next day. The next day remove from the fridge and continue with the instructions.
Preheat your oven to 430 degrees F
Line a 13x9 baking pan with parchment paper and spray generously with avocado oil.
Turn the dough out onto a lightly floured surface and divide into 24 pieces of about 30g each. Shape each piece into a tight ball by folding the edges underneath and rolling against the counter to build surface tension.
Arrange the dough balls close together in 6 rows of 4 so they will touch and merge as they proof. Cover loosely and proof at room temperature for 1 to 1.5 hours until puffy and beginning to fill in the gaps between them.
Use oiled fingertips to gently dimple the top of each ball. Add about half a teaspoon of marinara to each ball, then scatter shredded mozzarella generously over the entire pan. Add pepperoni pieces and any additional toppings.
Bake at 430 degrees F for 20 to 25 minutes until the cheese is deeply golden and bubbling, the pepperoni is caramelized, and the dough edges are dark golden brown.
Let the pan rest for 10 minutes before pulling apart. The dough is too soft straight from the oven and will tear messily. After 10 minutes it firms up just enough to pull cleanly.