Preheat oven to 350°F (175°C).

Mix crushed pretzels, melted butter, and 3 tablespoons sugar in a bowl.

Spread pretzel mixture on a baking sheet and bake for 10 minutes; allow to cool completely.

In a large bowl, beat cream cheese and 1/2 cup sugar until smooth.

Fold in the whipped topping until fully incorporated.

Dissolve strawberry gelatin in boiling water and allow to cool to room temperature.

Stir sliced strawberries into the cooled gelatin mixture.

Layer the cooled pretzel crumble, cream cheese mixture, and strawberry gelatin mixture into 6 individual glasses.

Refrigerate for at least 3 hours until the gelatin layer is set.