Set the oven to 400°F and cover a baking sheet with parchment paper. The lined surface helps keep the starch coating from sticking as it bakes.
Slice the tofu into cubes measuring 1/2 inch to 1 inch, then gently blot and press them with paper towels. The cubes should feel less wet on the surface while keeping their shape.
Coat the cubes in a bowl with avocado oil, salt, and pepper before distributing 1 tablespoon cornstarch over them and tossing gently. Look for a light, even, matte coating rather than loose white powder or thick starch clumps.
Arrange the coated cubes with space between them and bake for 20 minutes, using tongs to turn them halfway through. The exposed edges should develop color and crispness rather than stay damp.
During baking, warm the toasted sesame oil in a small saucepan over medium heat and cook the minced garlic in it for a couple of minutes. The garlic should smell fragrant and begin turning lightly golden, not dark brown.
Stir in the honey, soy sauce, rice vinegar, and slurry of 1 teaspoon cornstarch mixed with 1 teaspoon water, then boil while stirring continuously for 30 to 60 seconds before taking the pan off the heat. The bubbling sauce should become glossy and thick enough to coat the tofu.
Once baking is complete, gently turn the hot tofu through the sauce off the heat, add any desired optional garnish, and serve immediately. Each piece should carry a glossy coating while its edges still offer some crispness.