Unless you are getting a full breakfast, like a breakfast platter, you are much better off using snack credits for smaller items like pastries and bagels. If you don't have spare snack credits to play with you can always buy a bag of bagels in the resort gift shop (assuming you are eating at a resort) and the food courts usually have toasters where you can toast them if you want to add those to your CS breakfast. Breakfast is not the greatest use of a CS credit, but still better than wasting one.