In a mixing bowl, beat the cream cheese, powdered sugar, sour cream, vanilla, and lemon juice until completely smooth and creamy.
Fold in the whipped topping until light and fluffy; do not overmix.
Stir in about 1.0 cup of the diced strawberries, reserving the rest for garnish.
Gently swirl the strawberry jam through the dip so ribbons remain visible.
Transfer to a serving bowl, sprinkle with graham cracker crumbs, and top with the remaining strawberries.
Chill for 30 minutes if time allows, then serve with graham crackers for dipping.
Notes
For the creamiest texture, make sure the cream cheese is fully softened before mixing. Substitute Greek yogurt for sour cream if preferred. Best served the day it’s made; stir before serving if any separation occurs.