Heat a skillet over medium heat. Once hot, add the sliced mushrooms and coconut aminos or tamari and cook for about 4-5 minutes, stirring frequently or until the mushrooms are browned and cooked down to half their original size. Set aside.
To a food processor, add quinoa and nuts or seeds and pulse into a loose meal (some texture is good, careful not to over-process and turn into a powder).
Add the baked pinto beans, mushrooms, salt, pepper, garlic, fresh herbs, paprika, and other optional ingredients such as fennel, cayenne or pepper flakes and date (effective for binding ingredients and for a well-balanced flavor). Pulse a few times to combine (some texture is good).
The texture should be moldable when squeezed in your hands. If too dry, add more coconut aminos or tamari. If too wet, stir (not blend) in some extra quinoa. (Note: The more you pulse / blend, the wetter the texture will become. So pulse just until combined to preserve the texture.)
Taste a small amount and adjust flavor as needed, adding seasonings to taste (add more coconut aminos for depth of flavor/saltiness or paprika for smokiness).
Form the mixture into approximately 8 patties. (Note: Layer patties between parchment paper and freeze at this point for up to 1 month or refrigerate up to 5 days. For maximum freshness freeze after 2 days)