Let cream cheese come to room temperature, it needs to be soft enough to spread. Add blueberries and brown sugar to bowl with cream cheese and mix until combined. Its ok if the berries get squished.

Heat a small pan on medium and melt some butter in , but put one piece of bread on before it completely melts. On the other half spread the mixture, then top the other half. You want it to be warmed through so you want to add it before the first side gets too brown. Then when your ready to flip it just add more butter to the pan and flip.