Line a baking sheet with parchment paper and lightly grease the parchment with avocado oil spray.
Add the softened cream cheese, shredded cheddar, egg, Parmesan, mayonnaise, Old Bay seasoning, garlic powder, onion powder, salt, pepper, lemon juice, and green onion to a mixing bowl and stir until completely smooth and well combined.
Gently fold the lump crab meat into the cheese mixture until evenly distributed, taking care not to break up the crab pieces too much.
Taste the crab mixture and adjust the seasoning with additional salt, pepper, or Old Bay if desired, then refrigerate the bowl for at least 20 minutes to firm up the mixture for easier shaping.
In a shallow dish, combine the crushed pork rinds, almond flour, smoked paprika, and grated Parmesan, mixing well to create the crunchy keto coating.
Use a small cookie scoop or a tablespoon to portion the chilled crab mixture into small mounds, then roll each portion between your palms to form a compact ball.
Roll each crab ball in the crunchy coating mixture until completely covered on all sides, then place the coated balls onto the prepared parchment lined baking sheet.
Preheat the air fryer to 375°F, or preheat the oven to 400°F if baking instead of air frying.
Arrange the coated crab balls in a single layer in the air fryer basket or on a parchment lined baking sheet, leaving a little space between each ball for air circulation.
Lightly mist the tops of the crab balls with avocado oil spray to help them crisp and brown during cooking.
Air fry the crab balls at 375°F for 10 to 12 minutes, or bake at 400°F for 14 to 16 minutes, until the coating is golden brown and the centers are hot and just beginning to bubble.
Let the crab bomb balls rest for 3 to 5 minutes to firm slightly, then serve warm with your favorite keto friendly dip or a simple side salad.