Preheat the oven to 350°F (180°C).
Mix the cream cheese, butter, and sugar in a food processor until smooth.
Add the flour, salt, egg, and yeast to the processor and mix until a dough forms.
Wrap the dough in plastic wrap and chill for at least 2 hours or overnight.
Roll out the dough on a floured surface to a thickness of about 1/8 inch.
Spread the strawberry jam over the dough, leaving a 1-inch border around the edges.
Sprinkle the chopped walnuts over the jam.
Roll the dough into a log and cut into 12-15 pieces.
Place the rugelach on a baking sheet lined with parchment paper, leaving about 1 inch of space between each piece.
Bake for 15-20 minutes, or until the pastry is golden brown.
Remove from the oven and let cool on a wire rack for 10-15 minutes before serving.