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Place tofu, milk, soy sauce and nutritional yeast into food processor and blend until a smooth, thick paste forms, scraping bowl as needed.
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Preheat oven to 350. Arrange shells on baking sheet.
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Heat oil in medium skillet over medium heat. Add onion and sautee until softened, about five minutes.
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Add garlic and spinach and continue to sautee until spinach wilts, about another minute.
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Add tofu mixture and scallions and reduce heat to low. Cook, stirring frequently, until tofu softens and everything is evenly blended.
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Spoon mixture evenly into shells. Bake for about 10 minutes, or until tops begin to brown.
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Serve warm. I like to eat mine with a little hot sauce.