Place the mushrooms in a bowl and cover with 1 cup hot water. Let soak for 10 minutes to soften, then drain, reserving the water. Roughly chop the mushrooms.
Place the oats in the base of a food processor and process to create a fine oat flour. Add in the rest of the ingredients and process on low for ~30 seconds until combined. The mixture should be cohesive and easily able to stick together, but not creamy and smooth. You want some texture of the beans visible, as in the photos above. If the mixture is too dry, add in a little of the reserved mushroom soaking water. If too wet, add in more oat flour.
Taste, the mixture should taste good before cooking. As needed, add more salt/pepper/seasonings.
Form mixture into ¼ cup patties, then heat a thin layer of olive oil in a skillet over medium heat. Add the patties and cook for 3-4 minutes per side until crispy.
Serve as you would your favorite sliders
