Step 1

Halve the bread lengthways and place each half with the cut facing up. Spread the butter on all halves.

Step 2

Thinly slice the mushrooms and top the bread halves with an even layer of mushrooms.

Step 3

Grate the cheese and add it over the mushrooms making sure to cover the whole length of the bread.

Step 4

Toast in the preheated oven at 200°C (390°F) for 10 minutes, until the cheese melts and the bread gets nicely toasted.

Step 5

Squeeze the ketchup in a zig-zag pattern over the sandwiches, top with minced chives and crisp fried onions if desired.