Dilled Pork Stroganoff

Ingredients

• 3 cups uncooked medium egg noodles (about 6 ounces)
• 1 (1-pound) pork tenderloin, trimmed and cut into 1/2-inch strips
• 1/2 teaspoon salt, divided
• 1/4 teaspoon black pepper
• 2 1/2 teaspoons butter, divided
• Cooking spray
• 1/2 cup fat-free, less-sodium chicken broth
• 2 cups chopped Walla Walla or other sweet onion
• 1 (8-ounce) package presliced mushrooms
• 1 cup low-fat sour cream
• 1 tablespoon chopped fresh dill
• 1 tablespoon Dijon mustard
• 1 teaspoon all-purpose flour
• Dill sprigs (optional)