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Polish open-faced sandwich zapiekanka with mushrooms and cheese.

Zapiekanka, Polish toasted sandwich

An open-faced baguette sandwich topped with cheese and mushrooms and toasted in the oven. Finish it with a squeeze of ketchup and some crisp fried onions.

Course Appetizer, Snack
Cuisine Polish
Keyword open-faced sandwich, polish sandwich, toasted sandwich
Prep Time 10 minutes
Cook Time 10 minutes
Total Time 20 minutes
Servings 2 people
Calories 629 kcal
Author Eva | Electric Blue Food


  • 2 demi baguettes or similar long white sandwich rolls
  • 150 g cheese hard cheese like gouda, cheddar
  • 150 g button mushrooms
  • 50 g butter room temperature
  • 4 tbsp ketchup
  • 2 tsp chives minced
  • 2 tsp crisp fried onions optional


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

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

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

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

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

Recipe Notes

  • Use the oven in conventional heating mode. This ensures a homogeneous distribution of the heat to perfectly toast the bread while melting the cheese. Broil/grill mode may brown the cheese too quickly.
  • The steam created by the melting butter and cheese will cook the thinly sliced mushrooms. This is why we are adding them raw.
  • The nutritional information provided is only an estimate and it is referred to the basic zapiekanka recipe. Additional toppings will increase the calorie tally.
Nutrition Facts
Zapiekanka, Polish toasted sandwich
Amount Per Serving
Calories 629 Calories from Fat 441
% Daily Value*
Fat 49g75%
Saturated Fat 30g188%
Trans Fat 1g
Cholesterol 133mg44%
Sodium 1084mg47%
Potassium 444mg13%
Carbohydrates 26g9%
Fiber 2g8%
Sugar 10g11%
Protein 24g48%
Vitamin A 1574IU31%
Vitamin C 3mg4%
Calcium 620mg62%
Iron 2mg11%
* Percent Daily Values are based on a 2000 calorie diet.