Preheat over to 300 degrees. Mix melted butter, garlic powder/salt, and parsley flakes until garlic powder is dissolved and mixture is clump free. Toss butter mixture with cubed bread in a medium bowl until cubes are evenly coated. Spread coated bread cubes on a cookie sheet in a single layer. Bake for 15 minutes and check to see if they are dry, crispy, and golden brown. Stir the croutons around and bake for an additional 15 minutes until done. Store croutons in air-tight container or ziplock bag. Enjoy!