Polish Open-Faced Toasted Sandwiches {Zapiekanki}

Name: Polish Open-Faced Toasted Sandwiches {Zapiekanki}
Ingredients: 1 baguette (about 80 cm / 30 inches); 16 oz / 500 g of button mushrooms; 2-3 tbs of butter; 14 oz / 400 g of cheese (I’m using Gouda; pepper jack, Muenster cheese or Swiss will do); Ketchup; Green onions, chopped; About 3 inch / 8 cm piece of smoked sausage, sliced; 1/2 small onion white or red, thinly sliced; 2 medium pickles, sliced; A pinch of red pepper flakes (optional); 4-6 slices of smoked bacon; 1 fresh jalapeño (or a few slices of pickled jalapeño); 4 tbs of plain yoghurt / greek yoghurt / sour cream; 1 tbs of mayonaisse; 1 garlic clove, minced; A pinch of salt; A pinch of sugar; A pinch of black ground pepper; A good squirt of lemon juice; 4-6 slices of smoked ham; A few tbs of French fried onions