Preheat the oven to 400 degrees.
Cut the chicken thighs into nugget sized pieces.
Put the arrowroot powder, onion powder, garlic powder and salt in a gallon sized plastic bag.
Crack the eggs into a large mixing bowl and wisk slightly.
Put the chicken pieces into the eggs and coat.
Place the chicken into the arrowroot powder mixture in the plastic bag in three batches.
Seal the gallon bag and shake the chicken until it is coated.
Put the coated chicken pieces in a strainer and shake the excess arrowroot powder onto a large plate.
Return the excess arrowroot powder to the bag and repeat steps for each batch.
Place nuggets on a large baking sheet.
Bake for 25 minutes.