2. Combine the butter, lemon juice, minced garlic, and parsley in a mixing bowl; mix thoroughly.
3. Top each mussel with some butter-garlic mixture. Top with grated cheddar cheese.
4. Place in a single layer in the Air Fryer basket. Do not stack, just cook in batches if needed. Turn on the Air Fryer and set time to 15 minutes, or until the cheese is bubbly and light brown.
5. Serve immediately with some lemon wedges and hot sauce if desired.