Season pork chops with salt, pepper, and garlic powder, and then press into 1/2 cup flour.
In a skillet over medium heat, lightly brown chops in a small amount of oil.
Place chops in crock-pot, 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.
The chops are very tender so be careful that they don't fall apart.
In a small bowl, blend 2 tbsp 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.