Use a hand or stand mixer to whip the cream cheese, jam, milk, and vanilla extract together in a large bowl. Mix until the ingredients are combined and the cream cheese is light and fluffy.
Divide the whipped cream cheese onto each piece of bread, spreading it in an even layer.
If desired, use a cookie cutter to cut out 4 heart shapes from each slice of bread. Avoid cutting into the crusts on the bread, and leave the cream cheese side up. Alternatively, prepare the sandwiches whole, merely slicing the crusts of the bread off.
Add a single layer of strawberry slices on one piece of cut-out bread and then top with another cut-out to form a sandwich. Repeat this step until you have all 12 mini sandwiches completed (or three full size ones, cut into 4 triangles).
Place on a platter, serve and enjoy!