In a large bowl, toss the tofu cubes with two tablespoons of BBQ sauce. Arrange the tofu on a lined baking sheet, then bake for 20 minutes. Set aside, and don’t turn off the oven yet.
Pour ½ cup of BBQ sauce into the bottom of an 8×8" glass baking pan, and shake the pan to spread the sauce out evenly. Arrange the baked tofu cubes on top, then top off with the rest of the sauce, shaking again to distribute the sauce.
Stick the uncovered pan of tofu and BBQ sauce into the oven, and bake for 30 minutes.
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Notes
Make sure that you choose a BBQ sauce that's free of honey, anchovies, meat, meat stock, or other animal products.