If you want to propose to her on her birthday, have a birthday cake made for her with the words of proposal on it, have it delivered to her while you are with her, and then tell her that is your way of proposing to her.
There are 343 calories in 1 slice of King Cake. Get full nutrition facts and other common serving sizes of King Cake including 1 oz and 100 g. Register | Sign In
My rule of thumb is that a pat of butter is 100 calories and a slice of bread is 100 calories. This is just a ballpark because calories are mostly irrelevant. If you want less calories from bread and butter, eat less.