Cut chicken breasts in half widthwise to create thinner pieces.
Season both sides with salt and pepper.
Heat skillet over medium heat and melt 3 tablespoons butter.
Add chicken in single layer and cook 4-5 minutes without moving.
Flip and cook 3-5 minutes until internal temperature reaches 165F.
Remove chicken to plate and rest.
Take skillet off heat and add remaining 1 tablespoon butter.
Add minced garlic and sauté 30 seconds to 1 minute until fragrant.
Pour in heavy cream and scrape up browned bits from pan bottom.
Return skillet to medium heat and simmer 1-2 minutes until sauce thickens slightly.
Remove from heat and nestle chicken back into skillet.
Spoon sauce over chicken to coat.
Garnish with fresh parsley and serve immediately.