In a mixing bowl add the soften or partially melted butter and cream cheese. Mix until smooth.
Add the egg yolk and mix well.
Add the raspberry muffin mix. Mix well until there are no clumps of the dry mix.
Fold in the white chocolate chips.
Cover the cookie dough with a lid and place it into the refrigerator for 1 hour.
Preheat oven to 350°F and line a baking sheet with parchment paper.
Remove cookie dough from the refrigerator and form into 6 even portioned balls.
Place them about 2 inches apart on the cookie sheet and bake for 10 minutes.
Try not to over bake them especially if you want chewy cookies, slightly golden brown on the edges.
Allow them to cool on the baking sheet for 5 minutes. Then place the cookies on a cooling rack to fully cool. Enjoy.