Place the frozen pretzels on a baking sheet lined with baking paper and cover each with 1 slice of Gouda cheese. Then top with ham and mushrooms or salami with tomato peppers or hot peppers as desired. Finally, cover each with a slice of Gouda cheese.
Now in the oven for approx. 20 - 30 minutes at 180 ° C. Serve with a mixed salad.