Preheat oven to 350 degrees F. In a small bowl, mix together melted butter, olive oil, garlic powder, and salt
Place the bread cubes in a large bowl and pour the butter mixture over top. Toss until bread is evenly coated with butter mixture
Place on baking sheet in one layer and bake in preheated oven for 15-20 minutes or until golden brown and crispy. Remove from oven and cool completely. Store in freezer storage bag or airtight container