Pepperoni Pizza Spaghetti Squash Boats

medium spaghetti squash (halved lengthwise, seeds removed and roasted, cooked in the microwave or Instant Pot)

your favorite brand pizza sauce (sugar free)

shredded mozzarella cheese

to 15 pieces small nitrite-free pepperoni rounds

grated Parmesan or Locatelli for serving (optional)

crushed red pepper flakes for serving (optional)