Peel and slice potatoes about 1/8 inch thick or thinner. Slice onion thinly. In a large frying pan on medium-high heat, melt butter, add olive oil. Add sliced potatoes and onions, cover and fry for 10 minutes. Using a spatula, turn the potatoes and onions over so they do not break apart. If potatoes appear too dry, add some additional butter. Sprinkle with granulated garlic powder, dried dill weed, salt and pepper and continue to fry with cover removed for another 5 minutes or until potatoes begin to turn slightly brown; turning occasionally. Serve hot with your meal. Note: You may use 2 or 3 large garlic cloves (chopped small), instead of granulated garlic powder. Add to the potatoes after the first 10 minutes of cooking time.