Preheat oven to 350F. Line a baking sheet with parchment paper. Place one sheet of phyllo dough on a clean work surface. Fold it in half widthwise then brush butter all over it. On the short end of the pastry sheet, place 5-6 slices of pepperoni then top with a hefty sprinkle of mozzarella cheese and a dash of dried oregano. Roll the phyllo sheet up over the filling, tucking in the side edges to seal it (creating a phyllo burrito). Place the phyllo roll on the parchment paper lined baking sheet seam side down. Repeat with remaining ingredients (should yield about 20 rolls). Brush tops phyllo rolls with butter than garnish with flaky sea salt and bake for 25 minutes, or until golden and flaky. Serve warm with pizza sauce!