Peel and finely dice the onion. Drain corn in a colander. Clean and wash bell pepper, cut in half, remove seeds and white membranes and finely chop. Clean mushrooms and cut into thin slices. Pure tomatoes, wash, rub dry and cut into quarters.
Mix the tomato paste, whipped cream, and sour cream well with a whisk—season with salt, pepper, oregano, and basil.
Grate cheese and add about half to cream mixture along with vegetables and mix.
Line a baking sheet with parchment paper. Cut rolls in half, place on a baking sheet, and spread with sauce. Sprinkle remaining cheese on top.
Bake vegetarian pizza rolls at 200 °C for about 15-20 minutes.
Meanwhile, wash basil, shake dry, pluck leaves, chop finely and sprinkle over finished rolls.