Start by preheating your oven to 400°F (200°C).
In a large mixing bowl, combine ¼ cup of the buffalo wing sauce, finely chopped celery, beaten egg, and chopped chives. Mix well.
Stir in the almond flour, oat fiber, salt, and garlic powder until just combined.
Gently add the ground chicken to the mixture. Mix until everything is just combined, being careful not to overmix, which can make the meatballs tough.
Use a cookie scoop to form individual meatballs. Create a small indentation in the center of each, add about 1 teaspoon of blue cheese crumbles, then carefully seal the meatball so the cheese is completely enclosed. For best results, chill the formed meatballs for at least 1 hour (or up to 6 hours).
Line a baking sheet with aluminum foil for easy cleanup, then place a baking rack on top. Arrange the chilled meatballs on the rack and bake for 15 minutes.
Remove the meatballs from the oven and gently toss them in the remaining buffalo wing sauce until fully coated. Return them to the baking rack and bake on the top oven rack for another 7-10 minutes, or until their internal temperature reaches at least 165°F (74°C).
Serve these delicious meatballs warm on a platter. For an extra touch, drizzle with blue cheese dressing and offer more on the side for dipping. Toothpicks make them easy to grab, and a side of fresh celery sticks complements the flavor perfectly.