Remove the potatoes from the oven.
Insert a knife in the middle. If it goes in easily then the potatoes are cooked.
Immediately make a slit lengthwise.
Using two small kitchen towel pieces, squeeze the potatoes from the sides. This opens up the potatoes wider.
Fluff the inner soft potato a bit.
Add 1 tsp each of butter in each potato.
Sprinkle a little salt and pepper.
Add about 2-3 tbsp each of the Marinara Sauce.
Add the cooked mushrooms. I divided them between the two potatoes.
Add the sweet corn, onion, olives and chilli flakes.
Divide and add the shredded between the two.
Return the potatoes to the oven.
Bake for 7-10 minutes or till the cheese melts.
Serve Jacket Potatoes with extra Marinara Sauce on the side.