Preheat your oven to 425F. Line a large sheet pan with parchment paper or a silicone mat for easy cleanup.
In a small bowl whisk together honey, soy sauce, minced garlic, paprika, salt, pepper, lemon juice if using, and water or broth. This will be your glaze and saucy base.
Toss the cubed sweet potatoes with a tablespoon of olive oil and a pinch of salt. Spread them in a single layer on the sheet pan.
Pat the chicken thighs dry with a paper towel. This helps the skin get a nice crisp. Place the thighs on the sheet pan beside the potatoes.
Brush or spoon a portion of the honey garlic mixture over the chicken and potatoes. Reserve a little glaze for basting later.
Roast for about 20 minutes. Then give the pan a stir, flip the pieces if you like, and brush with the remaining glaze.
Continue roasting for another 10 to 15 minutes, until the chicken reaches an internal temperature of 165F and the potatoes are tender when pierced with a fork.
If you want extra color, switch to the broiler for 1–2 minutes at the end, watching closely so nothing burns.
Remove from the oven, let rest for a couple of minutes, then sprinkle with sesame seeds or chopped parsley if you have them. Serve warm.