Heat olive oil and butter in a large skillet over medium heat.
2 tablespoons olive oil, 3 tablespoons butter
Add the rosemary sprigs and sauté for 15-30 seconds (just until crisp but not brown). Transfer rosemary to a paper towel and turn the heat to medium-high.
6 sprigs fresh rosemary
If using large chicken breasts, butterfly (cut in-half lengthwise) then pound (with a meat pounder) until even in thickness. If using small-ish breasts, just pound to an even thickness.
4 chicken breasts
Season the chicken with salt & pepper and place in the pan. Cook 4 minutes per side. Transfer chicken to a plate. Reduce heat to low.
salt, freshly grounded black pepper
Deglaze the pan drippings by adding the wine to the pan while scraping it with a spatula.
1 cup white wine
Turn heat to medium-low, add garlic and sauté the garlic for 30 seconds. Add in the mustard, cream, Worcestershire sauce, and yogurt and stir until smooth. Cook the sauce 5 minutes, and add the chicken breasts. Cook an additional 10-15 minutes until sauce is thickened and chicken is no longer pink in the middle. A meat thermometer inserted in the thickest part of the breasts should read 160°F (165° max). 4 cloves garlic, 3 tablespoons Dijon mustard, 1 cup heavy whipping cream, ¼ cup plain Greek yogurt, 2 tablespoon Worcestershire Sauce
Garnish the chicken with the fried rosemary sprigs. Serve with mashed or baked potatoes or pasta. Enjoy!