In a frying pan, melt bacon fat if need be then spread on to a tinfoil lined baking sheet. Place cubed bread on baking sheet and rub around in the bacon fat until every piece of bread is coated. Then sprinkle on the garlic powder.
Bake for 350 degrees on the middle rack for 10 minutes. Toss the croutons and bake again for an additional 5 minutes until golden brown. Let them cool and then seal in an airtight container for up to 2 weeks.
Notes
I've had these still taste great for up to two weeks! Feel free to scale the recipe to however much bread you have on hand.