That's almost exactly the same thing I eat for breakfast
I do a whole wheat english muffin, natural peanut butter and a yogurt on the side. I do throw in an extra banana (I liked it sliced on top of my english muffin so it's like an open faced peanut butter and banana sandwich). The whole thing comes to about 400-450 calories depending on the brand of muffins and the weight of the banana, gives me a good boost in the morning and some much-needed protein. It is a little high on the carb side with the fruit added (I balance it out with a lower carb lunch most days), but I find it's a nice, balanced breakfast for me and something I can easily throw together at work.