The camping instructions are similar as above but the times will vary depending on how hot your fire is. I used multiple pans to speed up the process. If you don't have multiple camping pans don't worry, each component of the recipe can be cooked separately in the same pan then set aside on a plate or foil. You'll have the chance to reheat all the ingredients during the last step.
If you have time, pre-cut your onion, green pepper, and jalapeño at home.
Start by making a roaring fire so you'll have hot coals to cook with.
Now, you can either use foil packets to cook the steak, green pepper, onion, and jalapeno, OR you can cook the meal in a skillet on a grill grate. You may want to omit the garlic using the hobo method, you don't want it to burn.
If you're cooking over the fire with a grill grate and skillet, you'll want to start by cooking your steak. If your steak fits into your camping skillet, sear both sides of your steak until the steak is medium rare and set aside and tent with foil, topping the steak with a knob of butter if you brought some. If your steak doesn't fit in your camping skillet, you can use your fire pit's grill grate or bring your own grill grate.
Heat a cast iron skillet over the fire. Add a splash of oil then the pepper, onion, jalapeño, and garlic. Season with salt and pepper. Once the vegetables sweat and get soft and in a couple splashes of soy sauce and a capful of apple cider vinegar (if using). Taste and adjust the seasonings to your liking. Dump the onion mixture onto some tinfoil and set aside until needed.
Season the mushrooms generously with oil, salt, and pepper. In the same skillet, you cooked the onion mixture, cook the mushrooms for a few minutes per side, or until they soften.
Flip the mushrooms over so they are bottom side up. Top mushrooms with the onion mixture, steak, then one slice of cheese. Tent or cover the mushrooms with foil or another pan to melt the cheese. Once the cheese is melted, place the mushrooms and get ready to feast!