Layer each piece of veal with a slice of prosciutto and a fresh sage leaf. Secure with a toothpick.
Lightly dredge both sides in flour and shake off any excess.
Heat olive oil and 2 tablespoons butter in a wide pan over medium-high heat.
Place the veal prosciutto-side down first and season lightly with salt and pepper.
Cook for 1–2 minutes, until the prosciutto is golden and slightly crisp.
Flip and cook the other side for another 1–2 minutes.
Add the white wine and scrape up any browned bits from the pan. Let it reduce by about half.
Turn off the heat and swirl in the remaining butter until the sauce becomes glossy and emulsified.
Spoon the sauce over the veal and serve immediately.