Heat oil in a layer in a skillet on medium-high.
Toss cubes of chicken in cornstarch and pan fry until brown.
Set aside.
Add olive oil to pan and garlic until fragrant.
Mix broth, hoisin, sugar, tamari an cornstarch.
Pour in the mixture until comes to a bubble.
Add chicken and toss to coat!
Serve over rice or with broccolini