Season pork chops with salt, pepper, and garlic powder, and then dredge in 1/2 cup flour. In a skillet over medium heat, lightly brown chops in a small amount of oil.

Place chops in slow cooker, and top with onion slices. Dissolve bouillon cubes in boiling water and pour over chops. Cover, and cook on Low 7 to 8 hours.

Preheat oven to 200 degrees F (95 degrees C).

After the chops have cooked, transfer chops to the oven to keep warm. Be careful, the chops are so tender they will fall apart. In a small bowl, blend 2 tablespoons flour with the sour cream; mix into meat juices. Turn slow cooker to High for 15 to 30 minutes, or until sauce is slightly thickened. Serve sauce over pork chops.