Why you’ll love this recipe

  • Mushrooms give a familiar sandwich more substance.
  • Low heat melts the filling evenly.

Ingredient notes

  • Five main ingredients, excluding salt and pepper.
  • Use bread sturdy enough to hold the mushrooms.

Equipment you’ll need

  • Large skillet
  • Wide spatula
  • Cutting board

Helpful cooking tips

  • Do not pile wet mushrooms onto bread.
  • Lower heat if the bread browns before the cheese melts.

Make it your own

Variations

  • Add a few spinach leaves to the filling; they add an ingredient.

Substitutions

  • Use Swiss cheese instead of cheddar.

What to serve with it

  • Serve with tomato soup or sliced cucumbers.

Storage, freezing & reheating

In the refrigerator

Divide leftovers into shallow containers and refrigerate within 2 hours (within 1 hour if above 90°F / 32°C). Keep at 40°F / 4°C or colder and use within 3–4 days.

In the freezer

Freshly made sandwiches have the best texture. Freeze the cooked mushrooms separately for up to 1 month rather than freezing the whole sandwich.

To reheat

Reheat a single portion in the microwave, loosely covered, stirring or turning halfway through. Heat to 165°F / 74°C throughout; add a spoonful of water if needed.

Frequently asked questions

Can I prepare the mushrooms ahead?

Yes. Refrigerate cooked mushrooms promptly and use within 3–4 days. Reheat them to 165°F / 74°C before assembling the sandwich.