Line a baking sheet with aluminum foil and lightly rub with olive oil. Set aside.
Preheat oven to 350 degrees Fahrenheit.
Take leftover bread and dice into cubes. About 1.5-2". Really any size you prefer, just try to make them as even as possible. Uniform pieces will bake at the same rate. Smaller ones will turn out much crispier than bigger pieces.
Drizzle the olive oil over the chunks of bread. They should not be completely coated and not drenched. Just enough to get the seasonings to stick to them.
In a small bowl, mix together the seasoning, garlic powder, onion powder, and salt.
Sprinkle the seasonings and toss so all the bread is evenly coated.
Spread in an even layer on the prepared baking sheet.
Place in the oven and bake for 15-20 minutes or until they are golden brown and crispy. Rotating the pan halfway through will help them bake more evenly.
You want them to be crispy but not too much. If they are baked too long they will become rock hard once cooled.
Keep in mind, they will continue to cook and get more crisp once they are removed from the oven.
Remove from sheet pan, allow to cool, and serve warm. They go great with a bowl of soup or on a salad.