200+ calories for the cake and 200+ calories for the two cookies. You're consuming close to 500 calories with just those three items and you are doing so in a time of day when metabolism slows down. So unless you're very athletic and active during the day you will gain weight.
For the past 4 days or so I've been eating a slice of chocolate cake & 2 cookies every night... am I going to gain a bunch of weight from this? I weigh 114 right now and eat healthy during the day.