Here is a homemade crouton recipe that is a favorite at our house. You can use any type of bread. I usually only make croutons when I have stale bread that needs to be used. Today I used stale hamburger buns. When I have these made, I store them in a zip top bag. My kids love to snack on them. And they make a wonderful addition to salads.
I am very guilty of not measuring when I cook. This is especially true with things like croutons. Here is what I use, but the seasoning options are only limited by what you can think of!
Bread
Olive Oil
Garlic Salt
Cayenne Pepper (use SPARINGLY!)
Chipotle Seasoning (I don't use this, bc I don't really care for it...but my mom uses it every time)
Dice the bread into desired size. Spread on cookie sheet. (I try to keep it into a single layer). Drizzle with olive oil. Toss to coat. Sprinkle with desired seasonings. Toss to coat.
Bake at 375 for 10 minutes. Check to see if they are done. If you like them really crispy, they will probably need a few more minutes. I like them a little "soft" on the inside, so when you bite into them they don't all but break your teeth.

(Ok...Sean NO laughing at this). I highly recommend that you set a timer EACH time you check on them. I am so very guilty of checking them, deciding they need a few more minutes, then forgetting about them until the oven is smoking and I have a cookie sheet (or 2) full of well seasoned charcoal. You would think after the first (or tenth) time, I would learn, but I haven't.