Remove steaks from refrigerator 20–30 minutes before cooking and pat dry.
Season both sides generously with salt, black pepper, and crushed peppercorns.
Heat olive oil in a heavy skillet over high heat until very hot.
Sear steaks 3–4 minutes per side for medium-rare (adjust for preferred doneness).
Add butter and garlic during the last minute and spoon melted butter over steaks.
Remove steaks and let rest 5–7 minutes.
Reduce heat and add brandy (if using), then beef broth, scraping browned bits from pan.
Stir in heavy cream and Dijon and simmer 3–4 minutes until slightly thickened.
Spoon peppercorn cream sauce over rested steaks and garnish with parsley.