Cut the chicken breast into bite-sized 1-inch chunks.
In a medium bowl, whisk together the arrowroot powder, sea salt, black pepper, and garlic powder.
Toss the chicken chunks in the arrowroot mixture until evenly coated.
Heat the avocado oil in a non-stick skillet over medium-high heat.
Add the chicken to the skillet and sear for 6-8 minutes, turning occasionally, until golden brown and cooked through.
While the chicken cooks, prepare the ranch dip by whisking together the Greek yogurt, dried dill, onion powder, and lemon juice in a small ramekin.
In a small saucepan or microwave-safe bowl, melt the ghee and stir in the hot sauce until well combined.
Once the chicken is finished, remove from heat and toss the bites in the buffalo sauce mixture until fully glazed.
Slice the celery and carrot into sticks.
Serve the warm buffalo chicken bites immediately with the chilled ranch dip and vegetable sticks on the side.