Unroll the crescent roll dough onto a lightly floured surface. Roll it out a bit just to hold it together & thin it out a bit. In a bowl, beat together the cream cheese, powdered sugar, & vanilla extract. Spread the cream cheese mixture over the crescent roll dough. Spread the strawberry jam over the cream cheese. Roll up from the long ends into a tube shape. Press the 'tube' with your hands to tighten the interior. Slice into 1 1/2 inch rounds. Place in a mini muffin pan that's been sprayed with nonstick cooking spray.