Place 15 of the 25 vanilla sandwich cookies into a food processor or blender and blend until they are small crumbs. Set aside.
Thaw 8 ounces frozen whipped topping.
Slice 1 pint strawberries.
In a mixing bowl, combine 3.4 ounces vanilla instant pudding and 2 cups milk. Whisk until thickened.
Fold the thawed whipped topping into the pudding and mix until well combined.
Lay out your parfait cups or glasses and evenly divide the crushed cookies among them in the bottom of the cups.
Divide 21 ounces blueberry pie filling among the cups, placing it on top of the crushed cookies.
Add the pudding mixture on top of the blueberry pie filling layer, dividing evenly between the cups.
Top with the fresh strawberry slices.
Cover and refrigerate until ready to serve (4 hours is optimal).
Garnish with remaining cookies before serving.
Notes
If you would like to prep the parfaits ahead of time, prepare the pudding and whipped topping mixture and the sliced strawberries in advance and store separately in airtight containers in the refrigerator for up to 24 hours. Crush the cookies and store in an airtight container at room temperature. Assemble the parfaits up to 4 hours before serving or transporting.