Put the peppercorns in a small ziplock bag and crush using a meat mallet or anything heavy.
Season chicken on both sides with salt and set aside.
In a large nonstick skillet over medium heat melt two tablespoons of butter.
Add chicken to the skillet, smooth side first, and sear to brown for 6 minutes. Do not cram the skillet and work in batches if necessary.
Flip to the other side and sear for another 4 minutes.
Remove chicken and place on a plate.
Pour off remaining butter in the skillet, if any, then melt the remaining butter in the same skillet.
Add shallot and saute until tender.
Add broth and stir to scrape the brown bits from the bottom of the skillet.
Pour in cream, and add thyme and peppercorn.
Bring mixture to a simmer then add chicken with any accumulating juices.
Baste the chicken with the sauce and continue to cook until chicken is done.
Pour in lemon juice and mix the parsley if using.
Taste to adjust seasoning.
Continue to cook for a couple of minutes or until sauce thickens.