Gather all ingredients.

Spray a skillet with cooking spray and heat over medium-high heat. Quickly brown pork chops in the skillet, seasoning with garlic salt, 5 to 7 minutes total.

Transfer to a slow cooker and pour French onion soup on top.

Cover and cook on Low for 8 hours.

Remove the chops and keep warm. Add sour cream and flour to the slow cooker, mix well, and warm until slightly thickened, 10 to 15 minutes.

Serve sauce over the chops.