Line a large cookie sheet with parchment paper and set the over to preheat to 350°F.
Chop the mushrooms to a rice like consistency either by hand or with a food processor. Place in a large bowl.
Pulse or chop the walnuts to the same consistency and place in the bowl with mushrooms.
Add the 3 cups of riced cauliflower to the bowl. (Frozen is fine. It does not need to thaw).
Add the soy sauce and mix well.
Now stir in the spices and mix well, making sure it all combined and mixed thoroughly
Spread the mixture onto the cookie sheet and bake for 30 minutes.
Stir lightly and continue baking for an additional 10 minutes.
Assemble tacos and garnish with toppings such as: lettuce, tomatoes, onion, avocado, jalapeños, salsa, etc. ENJOY!