Preheat your oven to 400°F and line a baking sheet with parchment paper.
Place the cornflakes in a sealed bag and crush them into coarse crumbs using a rolling pin.
Transfer the crumbs to a shallow bowl and stir in the garlic powder, paprika, sea salt, and black pepper.
In a second shallow bowl, whisk the egg until smooth.
Dip the chicken breast into the egg wash, then press firmly into the cornflake mixture until the chicken is completely and evenly coated.
Place the chicken on the prepared baking sheet, drizzle with olive oil, and bake for 18 to 22 minutes until the crust is golden and the chicken is cooked through.
While the chicken bakes, steam the broccoli florets for 5 minutes until they are tender-crisp and vibrant green.
In a small ramekin, whisk together the Dijon mustard and honey to create the dipping sauce.
Serve the crispy chicken immediately alongside the steamed broccoli with the honey mustard sauce on the side.