Prepare the Filling: In a bowl, mix tuna, mayo, gherkins, sundried tomatoes, salt, and pepper. Stir until well combined.
Assemble the Wrap: Lay a tortilla flat. Add spinach, tuna mixture, bell peppers, and shredded cheese in the center.
Fold the Wrap: Fold the top and bottom slightly over the filling, then fold the left side over the center and roll tightly.
Grill the Wrap: Heat a non-stick pan over medium heat, lightly brush with oil, and place the wrap seam-side down. Cook for 2-3 minutes per side until golden brown.
Serve & Enjoy: Let it rest for a minute before slicing in half. Serve warm with your favorite sides like salad or soup!