Preheat oven to 400ºF.

For the pizza dough:
In a large bowl mix butter, sour cream and salt. Add flour 1 cup at a time, mixing well after each addition. Dough should be soft, slightly oily, and should not stick to your fingers. When you reach this point stop adding flour. Do not add too much flour because dough will become tough.

Split dough in half. Knead each piece of dough in your hands, adding a little more flour if needed, and form each piece into a ball.

Using sunflower oil, grease 2 large cast iron pans (preferred) or pizza pans and sprinkle each pan with 1 teaspoon flour and 1½ tablespoons breadcrumbs. Spread dough out over surface of the pans and form the crust. Sprinkle dough with the remaining breadcrumbs.

Spread 2 tablespoons ketchup over each pizza (optional) then layer tomato slices over the top, laying them side by side and completely covering the pizza. Add broccoli and red pepper slices (and any additional toppings desired, except pepperoni), then sprinkle with cheese and a dash of oregano (optional).

Bake for 35-50 minutes. At about 10 minutes before pizza is done, top with pepperoni slices and put back in the oven to finish baking.