Place the chicken tenders in a gallon zip-top bag and pour in the buttermilk; toss to coat and refrigerate briefly if desired.
Preheat the oven to 425°F (220°C) and line a baking sheet with parchment paper.
In a medium bowl combine the crushed corn flakes, flour, dried parsley, dried chives, dried dill, garlic powder, onion powder, cayenne pepper, kosher salt, and a generous grind of black pepper; stir to mix evenly.
Remove each chicken piece from the buttermilk, letting excess drip off, then dredge in the crumb mixture pressing gently so the crumbs adhere; place on the prepared baking sheet without crowding (use a second sheet if needed).
Lightly brush or drizzle the coated chicken with extra virgin olive oil and bake for 15–20 minutes, until cooked through and golden; internal temperature should reach 165°F (74°C).
While the chicken bakes, make the honey mustard: combine Dijon mustard, honey, olive oil, lemon juice, 1/4 teaspoon cayenne, and salt and pepper in a jar or bowl and whisk or shake until smooth.
Serve the chicken fingers topped with flaky salt and chopped fresh chives or parsley with the honey mustard on the side for dipping.