Preheat the oven to 375°F. Pat the chicken thighs dry with paper towels, then season both sides with salt, pepper, and poultry seasoning.
Melt butter in an oven safe skillet over medium heat. Sear the chicken thighs for 2 to 3 minutes per side until golden brown. Remove and set aside.
In the same skillet, melt butter and sauté garlic for about 1 minute until fragrant.
Add flour and stir continuously for 1 minute to form a smooth roux.
Slowly pour in chicken broth while whisking. Add heavy cream and Parmesan cheese, stirring until the sauce becomes creamy and smooth.
Return the chicken thighs to the skillet and spoon sauce over the top.
Bake uncovered for 30 to 35 minutes until the chicken is fully cooked and the sauce is bubbling.
Garnish with fresh herbs and serve warm with mashed potatoes, pasta, rice, or roasted vegetables.