In a bowl, mix together the cream cheese and jam. Spread this mixture onto the bread slices and pair them to make 3 sandwiches. In a large baking dish, whisk together the eggs, egg nog, & vanilla extract. Dip the sandwiches in the prepared mixture to soak up the egg nog. Melt butter in a non-stick pan over medium flame. Place the sandwiches in batches and cook for 2 mins on each side to brown. Transfer sandwiches to a plate and cut each in half and serve with fresh berries.