Not exactly what you describe but same flavor profile -- I make this one a lot:
https://www.bonappetit.com/recipe/creamy-pasta-with-crispy-mushrooms
Key is to get the right mushrooms. Shiitake are my favorite but they are often pricy so I will sometimes do half shiitake, half crimini.
I like it a bucatini but you could also do it with a pappardelle which s probably what that flat, sheet-style pasta you had was. Pappardelle is one of the easiest pastas to make at home if you have a pasta press (or attachment for a stand mixer) because it doesn't require a special extruder and you can just freehand cut the sheets. You can also buy it fresh at an Italian store or even Whole Foods. Fresh pasta can make a difference for a dish like this.