01 - Combine milk, ice cubes, granulated sugar, vanilla bean seeds (or vanilla extract), and vanilla pudding mix in a blender canister. Process on high setting for 30–45 seconds until completely smooth and slushy. The mixture should have a uniform, creamy consistency without visible ice chunks.
02 - Pour heavy cream into a chilled mixing bowl. Add powdered sugar and whisk vigorously or beat with a hand mixer until soft peaks form. The cream should hold its shape when the whisk is lifted but still have a slightly glossy appearance. Alternatively, use store-bought whipped cream to save time.
03 - Divide the blended frappuccino mixture between two chilled glasses, leaving about 1 inch of space at the top for topping. Mound a generous dollop of freshly whipped cream on each serving. Serve immediately with straws while the beverage maintains its slushy texture.