Prepare the Pudding Base:

In a large mixing bowl, whisk together the instant vanilla pudding mix and cold milk until smooth and slightly thickened (about 2 minutes).

Fold in the whipped topping and yogurt (if using) until creamy and fluffy.

Add the Mix-Ins:

Gently stir in the chopped strawberries, mini marshmallows, and cake cubes.

Mix until everything is evenly coated with the fluffy pudding mixture.

Chill:

Cover and refrigerate for at least 1 hour to allow the flavors to meld and the salad to firm up slightly.

Serve:

Spoon into bowls and garnish with extra strawberries or cake cubes if desired.

Best served chilled!