Prepare and chop your vegetables. Shred the spinach and carrots in a food processor.
Saute the onion, garlic, mushrooms, celery and spinach in a non-stick skillet with about 1/4 cup of vegetable broth. Cook until the onions are translucent, about 2-5 minutes.
Add the carrots to the sauteed vegetables; cook for about 2 more minutes.
Add the cooked rice and lentils to the vegetables; mix well. Scoop this into a mixing bowl.
Add the seasonings and stir well.
Add the remaining ingredients--oat flour, flaxseed, nutritional yeast flakes, nuts and raisins.
Mix everything thoroughly.
Add the mixture into a non-stick baking pan or one lined with parchment paper. Smooth it out as you would if you were making a meat loaf.
Bake for 25 minutes in a 400 degree oven.
Remove from oven and spread the desired glaze on top. Cook for another 10-15 minutes.
Remove from oven; allow the roast to set for about 10 minutes before serving. This allows it to firm up even more.
Happy Thanksgiving!