Speedy Chicken Stroganoff

Ingredients

• Freshly ground pepper
• ½ cup dry white wine
• 4 garlic cloves, thinly sliced
• 1½ cups low-sodium chicken broth
• ½ tsp. Diamond Crystal or ¼ tsp. Morton kosher salt, plus more
• 1 tsp. Dijon mustard
• 3 Tbsp. unsalted butter, cut into pieces
• 4 small thin-sliced skinless, boneless chicken breasts (about 1½ lb. total)
• 7 Tbsp. (or more) extra-virgin olive oil, divided
• 1 lb. crimini mushrooms, sliced ¼" thick
• 1 medium onion, thinly sliced
• 1 Tbsp. all-purpose flour
• ½ tsp. paprika
• ⅓ cup crème fraîche
• 2 dashes Worcestershire sauce
• Chopped parsley and cooked egg noodles, mashed potatoes, steamed rice, or country-style bread (for serving)