Here’s a new take on stuffed mushroom hors d’oeuvres, filled with the classic combination of beef and blue cheese. The air fryer cooks these up in just minutes to juicy perfection. Note: Cook times suggested are based on a counter-top family-size air fryer**; times will vary with different appliances so always check for doneness with a reliable digital instant-read thermometer and texture cues and adjust cook time as necessary. Ground beef is done when the thermometer reads 160°F (71°C).