Slice the cleaned mushrooms. Melt the butter in a frying pan and add a little olive oil. Fry the mushrooms in two batches, so there aren’t too many mushrooms on the pan at once. Fry for about 5-6 minutes until they turn brown. Season with salt and pepper towards the end of frying. Once they’re fried, remove from the pan and transfer to a separate dish.
Add some butter to the pan and pour in some olive oil, then throw in finely chopped onion and sauté it for 2 minutes. Then add the grated garlic cloves, mix with the onion and sauté everything for another minute. Pour in the white wine, stir, and wait until most of it evaporates. Skip the wine step if you’re not using wine.
Now add the orzo pasta to the pan and mix it with the onion. Add the mushrooms and pour in the broth and cream. The broth should be warm but not hot, and the cream should be at room temperature. Add Dijon mustard and season with salt and pepper. From the moment the broth and cream come to a boil, cook the pasta for about 8-10 minutes, ensuring the pasta is cooked and the sauce is thick enough. Important! Remember to stir the pasta frequently, as orzo tends to stick to the bottom.
Add dried thyme to the sauce and stir. Towards the end of the pasta cooking, add grated Parmesan and chopped parsley. Serve immediately. Enjoy.