I didn't give measures here. It depends on how many you are making. For this piece of 4 days old bread I used 2 garlic cloves and a tbsp of oil.
Heat up your frying pan and add the oil. You can make this in your oven, for a more lean version, turn your oven on at 400 f. Spray oil on the croutons and stir now and then.
While your croutons are having fun in the frying pan, chop your garlic. If you are doing them in the oven add salt and garlic when they are as crisp as you want them.
Mine are now done as I like them, golden brown and crispy. Turn off the heat.
Add garlic and salt. You do this off the heat to ensure that the garlic do not burn and become bitter. Toss. Serve.
As I said you can never make too many croutons this is for 2 humans.