Stir brown sugar, paprika, ground mustard, salt, black pepper, garlic powder, and cayenne pepper together in a small bowl until evenly combined.
Brush olive oil on pork tenderloin until coated. Rub spice mixture on all sides of tenderloin and let sit for 5 minutes.
Preheat an air fryer to 400 degrees F (200 degrees C).
Carefully place tenderloin in the air fryer basket and cook, undisturbed, in the preheated air fryer for 20 minutes.
Meanwhile, place broccoli in a microwave-safe bowl. Microwave on high until tender, about 3 minutes. Stir in olive oil and season with salt and pepper.
Transfer tenderloin to a cutting board and let rest for 10 minutes before slicing.
While tenderloin is resting, place broccoli in the air fryer basket. Cook for 10 minutes, shaking the basket halfway through.
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