Start by taking your paper towels and thoroughly patting down both the steak and the shrimp to remove excess moisture. This step is crucial because dry meat browns much better than wet meat, giving you that nice texture. Once dry, cut your sirloin steak into even 1-inch cubes so that they cook at the same rate as the shrimp.
Grab your large bowl and toss in the steak cubes, the raw shrimp, and your tablespoon of olive oil. Sprinkle the steak seasoning generously over the top and use your hands or a spoon to toss everything together until coated. You want to make sure every single piece has a nice coating of oil and spices for maximum flavor.
Take your bamboo skewers and alternate threading the steak and shrimp onto them, leaving a tiny bit of space between pieces. Do not overcrowd the skewer because the hot air needs to circulate around each piece to cook it properly. Depending on the size of your air fryer, you might need to trim the sticks to fit the basket.
Preheat your air fryer if your model requires it, then place the skewers in the basket in a single layer. Cook them at 400ºF (200ºC) for about 6 to 8 minutes, flipping them halfway through the cooking time. The shrimp should be pink and opaque, and the steak should be cooked to your preferred level of doneness.