Prepare all ingredients.

Boil the potato until fully cooked. While boiling, dice the onion into medium-sized pieces.

Lightly toast the tortilla until golden brown.

Mash the boiled potato and mix it with tuna, corn, diced onion, mayonnaise, and pepper.

Place the cheese on the toasted tortilla, then add the mixed filling on top.

Fold the tortilla securely to prevent the filling from spilling out.

Top the folded burrito with cheese and sprinkle parsley if desired.