Preheat the oven to 400°F and line a baking sheet with parchment paper.
Place the chicken breasts evenly spaced on the baking sheet.
In a small bowl, whisk together Herbs de Provence, garlic, olive oil, honey/maple syrup, lemon zest, lemon juice, salt, and pepper.
Pour half the mixture over the chicken breasts and bake for 20 minutes.
Toss trimmed asparagus in the remaining mixture and set aside.
When chicken is nearly done, remove from the oven, set oven to broil.
Arrange asparagus around the chicken and drizzle with leftover mixture.
Place lemon slices over everything and return to the oven.
Broil for about 10 minutes until asparagus is tender and chicken is golden and cooked through.
Serve hot with your favorite side.