Sprinkle salt on top of all chicken thighs. Arrange chicken thighs in an 8×8 baking sheet.
Whisk together olive oil, lemon juice, honey, mustard, pepper and red pepper flakes. Pour mixture on top of chicken, pressing the chicken down into the mixture to cover as much as possible.
Press rosemary sprigs in the dish throughout.
Bake for 25 minutes or until no pink remains in chicken.
Eat with some spinach or arugula. Garnish with fresh parsley.