Preheat the air fryer to 375°F for 5 minutes. Lightly spray the air fryer basket with non aerosol cooking spray.

Pat the sliced steak dry with paper towels and set aside.

Add the broccoli florets to a medium bowl, drizzle with the canola oil, and toss until evenly coated.

Spread the oiled broccoli in a single layer in the preheated air fryer basket with a little space between pieces. Air fry at 375°F for 6 to 8 minutes, shaking the basket halfway through, until bright green with lightly charred edges and crisp tender stems. Transfer the cooked broccoli to a large mixing bowl.

While the broccoli cooks, add the water, soy sauce, brown sugar, rice vinegar, grated garlic, grated ginger, sesame oil, red pepper flakes, and cornstarch to a microwave safe bowl. Whisk until the cornstarch is fully dissolved and the mixture is smooth.

Microwave the sauce on high for 1 minute, then whisk well. Return to the microwave and cook for another 30 seconds to 1 minute, whisking once more, until the sauce is thick and glossy and coats the back of a spoon. Keep warm.

Arrange the sliced steak in a single layer in the air fryer basket, leaving space between pieces so the air can circulate. Air fry at 375°F for 6 to 8 minutes, shaking the basket or flipping the strips halfway through, until the steak is browned on the edges and just cooked through but still tender.

Add the cooked steak to the bowl with the broccoli. Pour the hot sauce over the beef and broccoli and gently toss until everything is evenly coated.

Sprinkle with sesame seeds and serve immediately, ideally over cooked rice or noodles.