Potatoes and Carrots: These root vegetables form a hearty base, providing texture and absorbing the rich flavors of the casserole.

Leeks and Red Peppers: Known for their sweet and subtle flavors, these vegetables add a hint of brightness and color to the dish.

Spinach: A touch of green that introduces a mild, earthy flavor while boosting the meal's nutritional profile with vitamins and minerals.

Cheeses: A generous topping of grated cheese and mozzarella melts into a gooey, golden layer, adding a creamy richness that's irresistible.