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    The Donut Theory

    4.6 (12 reviews)
    Open 11:00 am - 9:00 pm

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    The Chicken Tender, Mac & Cheese, Cole Slaw and Theory Sauce
    Atlee M.

    The Donut Theory, previously in a food hall, is now an independant food bus! You will find them all over Knoxville, but likely most often near their sister donut shops Richey Cream in Knox and Maryville. The new bus is bright pink and filled with all the favorites. The Donut Theory is an exclusively gluten free establishment. They stick to that and are amazing at it. If you have any other allergens or dietary restrictions, just kindly ask them first. You may be suprised to hear, but they have more than donuts! I always enjoy their chicken tenders and mac & cheese. The tenders are the best ones I have ever had and the mac has this sublte bacon flavor that just catches me in all the feels. Don't forget to try some of their dipping sauces. My favorite is the Theory Sauce. I did make it home with 3 donuts, barely. All three will DELICIOUS. I had "The Parent Trap" which was oreo peanut butter, Birthday Cake, and my all time favorite salted butter. For gluten free it honestly doesn't get much better than this adorable pink bus! I can't wait to follow them around town!

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    5 months ago

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    1 year ago

    The owners are so sweet! Love their chicken and Gouda Mac and cheese!!! Can't wait for them to open in kerns food hall!

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    3 years ago

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    1 year ago

    So good hands down the best gluten free food I've ever had. And the doughnuts are insanely good

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    2 years ago

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    3 years ago

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    2 years ago

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    2 years ago

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    3 years ago

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    3 years ago

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    3 years ago

    Tried their donuts while visiting Knoxville. They're so delicious that I am going to call to see if they are willing to ship!

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    Review Highlights - The Donut Theory

    The Donut Theory, previously in a food hall, is now an independant food bus!

    Mentioned in 2 reviews

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    Captain Muchachos

    Captain Muchachos

    4.5
    (45 reviews)
    5.1 mi
    $$

    Found them due to the Knoxville Vegan Chef Challenge, so this review is a bit delinquent…read more We ordered the roasted sweet potato tacos as a bowl to make it gluten free. We also got the corn salsa and the habernaro salsa, which were both delicious. They were at the South Side garage when we found them, so we got some kombucha and an old fashioned that did not disappoint. Cody was manning the truck that day and he was so friendly, helpful and knew all about how to veganize their food and made any necessary adjustments. He even came into the garage to double check on preparation for us. He gave us service that was exceptional. The food was delicious and we need to find CM again stat! Loved the location and the ambiance of the Garage as well. The one downside is that the "location" calendar was a little hard to use since I wasn't familiar with some of the places listed on it and didn't know where those places were since there weren't address on many of the listings. But, I'm sure that's a software issue they have no control over. If you see the truck, stop! It's worth a visit.

    I was at Southern Skies Music Festival yesterday and got Nachos with chicken for $23. An absolute…read moredisappointment basically a bunch of chips almost no salsa and a few cubes of chicken. Never again for this food truck!

    Photos
    Taco sampler and chips and quesoooo
    Taco sampler and chips and quesoooo
    Sweet Potato tacos as a bowl
    Sweet Potato tacos as a bowl
    Kombucha, Old Fashioned, Habernaro Salsa and Corn Salsa at SouthSide Garage location

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    Kombucha, Old Fashioned, Habernaro Salsa and Corn Salsa at SouthSide Garage location

    The Donut Theory - donuts - Updated June 2026

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