Add cauliflower florets to your food processor and pulse until evenly ground into a taco-meat-like consistency, then remove cauliflower to a large bowl. (Be careful not to over-process or puree!)
Add all other ingredients to food processor, and pulse until they are a similar taco-meat-like consistency. Then, add the mushroom/walnut mixture to the bowl with your cauliflower and stir to combine. Spread combined cauliflower mixture on a greased baking sheet and bake it at 375 degrees for 30 minutes. Stir, and serve with your usual favorite taco fixings!
If you have a tree nut allergy in your house, just leave out the walnuts and use a larger head of cauliflower: It might change the texture a bit, but the results should still be darn tasty.
Chipotle Cauliflower Tacos from Mashup Mom: https://www.mashupmom.com/vegetarian-chipotle-cauliflower-tacos/