Heat the oven to 375°F. Lightly grease 8 cups of a standard muffin pan with the olive oil.
In a large bowl, combine the ground chicken, diced celery, almond flour, egg, 3 tablespoons of the blue cheese, 2 tablespoons of the buffalo sauce, garlic powder, salt, and black pepper. Mix gently until just combined.
Divide the mixture among the 8 greased muffin cups. Press it lightly into each cup without packing it too tightly.
Bake for 20 to 25 minutes, until the muffins are cooked through and the centers reach 165°F.
Spoon the remaining buffalo sauce over the muffins and sprinkle with the remaining blue cheese. Let them rest in the pan for 5 minutes before lifting them out.