How to Make It
To make the tomato powder: Using a rubber spatula, spread tomato paste onto a baking sheet as thinly as possible. Bake in a 200°F oven for 2-3 hours, checking every 20-30 minutes to make sure that the paste isn't burning. Scrape and re-spread paste to hasten the drying process. When the sauce is thoroughly dry and crumbly, remove from heat, cool, and grind to a powder in a food processor or a spice grinder. Store leftover tomato powder in a sealed container.
To make the Dorito powder: Combine all ingredients in a food processor or sealed shaker until thoroughly combined. Note: Some citric acid is not technically Paleo since it's made using corn, so make sure to do your homework, or just add a few drops of lemon juice.
To make the toast: Cut the sweet potato or squash into 1/4 inch slices. Toast the slices in a slotted toaster, toaster oven, or in a 400°F oven until cooked through, about 7 minutes.
To assemble: Brush the slices with the fat of your choice and sprinkle lavishly with the seasoning mix. Serve warm. Save any leftover powder in a sealed container in the refrigerator.