In a large bowl, whisk together the flour, sugar, and salt.
Cut in the cold butter with a pastry cutter or your fingertips until the mixture resembles coarse crumbs.
Add the sourdough starter and toss gently with a fork until the dough begins to hold together.
Bring it into a ball on a lightly floured surface, folding with a bench scraper until it just comes together.
Flatten into a disc, wrap tightly in plastic wrap, and chill for at least 1 hour (up to 3 days).
When ready to bake, let rest 5–10 minutes at room temperature. Roll into a 12-inch circle to fit your 9 in glass pie dish, leaving a small overhang. Press the dough gently into the bottom and up the sides. Prick the base a few times with a fork.
Make the Meat Sauce
Heat olive oil in a skillet over medium heat.
Add ground beef (or sausage) and cook until browned, breaking it up with a spoon.
Stir in pizza sauce, simmer uncovered for 5 minutes.
Assemble the Pizza Pie
Brush your crust lightly with olive oil.
Layer 1 – Cheese barrier: Sprinkle about 1 cup mozzarella over the bottom of the crust.
Layer 2 – Meat sauce: Spoon the sauce evenly over the cheese.
Layer 3 – Toppings: Add pepperoni, mushrooms, bell peppers, onions, and olives.
Layer 4 – More cheese: Top generously with the remaining mozzarella and a sprinkle of parmesan.
Bake
Preheat the oven to 425°F (220°C). I like to place it on the top rack and put an empty baking sheet on the lower one to catch any drips.
Bake for 35–40 minutes, until the cheese is bubbling and the crust edges are golden brown.
If the top browns too quickly, tent with foil during the last 10 minutes.
Notes
Tips for Best Results
Use very cold butter. The colder the butter, the flakier your crust. If it starts to soften while mixing, pop the dough back into the fridge for a few minutes before rolling it out.
Don’t overwork the dough. Once it starts to come together, stop kneading — overmixing can make the crust tough instead of tender.
Brush the crust with olive oil. It adds flavor and helps it bake to a golden, glossy finish that looks bakery-perfect.
Layer cheese before sauce. This simple trick is the secret to a crisp crust every time — it seals the bottom from moisture and creates that gooey “under layer” that deep dish is known for.
Let it rest after baking. Give it at least 10–15 minutes to cool before slicing. The layers will set, and you’ll get those perfect, picture-worthy wedges.
Use good quality pizza sauce. If your sauce tastes great from the jar or can, your pizza will too. If it’s thin, simmer for 5 minutes to thicken before layering.
Don’t skip the salt in the crust. It balances the butter and the sourdough tang — without it, your crust can taste flat.
Think high heat. Deep dish loves a hot oven. 425°F is the sweet spot for a golden crust and bubbly top without burning.