Prep the mushrooms: Clean mushrooms with a damp towel and finely chop. You want small pieces so they blend into the patty and cook quickly.
Sweat the mushrooms (optional but ideal): In a dry skillet over medium heat, cook the chopped mushrooms 4–5 minutes until they release moisture and concentrate in flavor. Cool for a couple of minutes.
Make the mixture: In a bowl, combine ground meat, cooled mushrooms, onion, garlic, Worcestershire, Dijon, salt, pepper, smoked paprika, and bread crumbs.
Mix gently with your hands until just combined. Don’t overwork it.
Shape the patties: Divide into four equal portions. Form 3/4-inch thick patties with a slight dimple in the center to prevent doming.
Preheat the air fryer: Set to 375°F (190°C) for 3 minutes.
Lightly spray the basket so the patties don’t stick.
Air fry the first side: Place patties in a single layer without crowding. Spray the tops lightly with oil. Cook 6–7 minutes.
Flip and finish: Turn the patties.
Cook another 4–6 minutes, depending on thickness and meat type. Add cheese in the last minute to melt.
Check doneness: Use an instant-read thermometer. Aim for 160°F for beef (medium), 165°F for turkey and chicken, or follow package guidance for plant-based.
Toast buns: Toss buns into the air fryer for 1–2 minutes until lightly crisp.
Build your burger: Add sauce to buns, stack the patty, and finish with your favorite toppings.
Serve right away.