Preheat oven to 350°F. Line a sheet pan with parchment.
Cream butter and both sugars until lightened.
Mix in egg and vanilla.
Add flour, baking soda, and salt. Stir until just combined.
Working quickly, fold in frozen raspberries and white chocolate chunks in 6–8 strokes.
Scoop immediately onto pan. Refrigerate 15–20 minutes.
Bake 10–12 minutes until edges are golden. Cool on pan 5 minutes before moving to a rack.