Prep the chicken: Pat the chicken dry. Season both sides with salt, pepper, garlic powder, and smoked paprika.
This helps build flavor and a nice sear.
Whisk the sauce: In a small bowl, mix Dijon, whole-grain mustard, honey, vinegar, and chicken broth. Taste and adjust—add more honey for sweetness or mustard for extra tang. Set aside.
Start the broccoli: Heat 1 tablespoon olive oil in a large skillet over medium-high heat.
Add broccoli and a pinch of salt. Cook 3–4 minutes, stirring occasionally, until bright green with some char. Transfer to a plate.
Sear the chicken: Add the remaining 1 tablespoon oil to the same skillet.
Place chicken in a single layer. Sear 3–4 minutes per side until golden. Don’t worry if it’s not cooked through yet.
Deglaze and simmer: Lower heat to medium.
Pour in the honey mustard sauce, scraping up browned bits. If using fresh garlic, stir it in now and let it bloom for 30 seconds. Add a pinch of red pepper flakes if you like heat.
Add broccoli back: Return broccoli to the pan, nestling it around the chicken.
Simmer 4–6 minutes, spooning sauce over the chicken, until the chicken reaches 165°F at the thickest part and the sauce thickens slightly.
Finish the sauce: Stir in the butter for extra gloss and body. Taste and adjust salt, pepper, or vinegar. If it’s too thick, splash in more broth; if too thin, simmer another minute.
Serve: Garnish with parsley and a squeeze of lemon, if using.
Serve with rice, quinoa, mashed potatoes, or warm bread to soak up the sauce.