Add shiitake mushrooms to a medium-sized bowl and hot water to cover. Let rehydrate until tender throughout, 15 minutes or so. Drain and rinse with running tap water to remove any debris. Squeeze out excess water. Remove and discard the tough stem, and mince the mushrooms.
Heat oil in a large skillet over medium-high.
Add ground chicken and break apart. Cook 5–6 minutes until browned and cooked through.
Add garlic + ginger. Cook 30 seconds (just until fragrant).
Add minced shiitake mushrooms to the skillet. Stir and cook for 1 minute.
Whisk soy sauce, hoisin, honey, sesame oil, and vinegar. Pour into pan.
Stir in cornstarch slurry. Simmer 2–3 minutes until glossy and slightly thick.
Spoon over warm rice and build bowls with toppings.
