Preheat the oven to 375 degrees F. Line a baking sheet with parchment paper (or oil a non-stick pan).
Whisk the honey mustard sauce ingredients together in a large bowl.
Set aside about 1/2 of the sauce.
For the other 1/2 in the large bowl, whisk in the egg.
Cube the chicken into small bite-sized pieces, then add it to the egg honey mustard sauce mixture.
Coat the chicken evenly, then let it marinate for a few minutes.
Mix the tapioca starch, garlic, salt, pepper, and crushed pretzels in a large bowl.
Add the marinated chicken to the pretzel mixture and toss it to coat evenly.
Spread the chicken bites on the baking sheet.
Lightly spray the tops of the chicken bites with avocado oil.
Bake for 25-30 minutes, flipping halfway.
Meanwhile, lightly pickle the cucumbers by combining the sliced cucumbers, vinegar, and salt in a bowl and mix. Set aside.
Sauté the corn on a skillet for a couple of minutes.
Assemble the bowls: warm the cooked rice and divide between the 4 bowls, add the crispy chicken bites, corn, pickled cucumbers, cherry tomatoes, and fresh avocado slices.
Drizzle with the set aside extra honey mustard sauce and enjoy!