Mix the melted butter (4 tablespoons), fresh thyme (2 tablespoons), garlic powder (1 teaspoon), lemon zest, salt, and pepper in a small bowl.
Spread the butter mixture on both sides of the chicken thighs and carefully under the skin, making sure to pull the skin back over the chicken and being careful not to tear it.
Place the chicken skin side up on a half baker's sheet and roast at 350 degrees F for one hour.
If the skin is not browned or as crispy as you desire, broil on high for a few minutes after the hour is up (being careful not to burn it!).
Remove chicken from pan and allow to sit for at least 5 minutes before serving.
Notes
For an extra lemony flavor, squeeze the juice from the lemon on top of the chicken after it's finished baking.
The provided nutrition information does not include any added sodium from seasoning to taste, any optional ingredients, and it does not take brands into account. Feel free to calculate it yourself using this calculator or by adding the recipe to Yummly.