Crush pretzels into small pieces. You don't want to crush too fine. Below shows a closeup of the baked crust, showing the varying sizes of the crushed pretzels. It's OK to have some small pretzel pieces.
In a 9x13 baking dish, spread evenly and press down the crushed pretzel mixture to make a crust.
Bake 8 minutes, remove from oven and let cool.
Whip cream cheese with ¾ cup sugar. Stir in Cool Whip.
Spread the cream cheese and cool whip mixture on the cooled pretzel mixture.
Make jello according to package directions. Place in refrigerator and watch for the jello to partially set. You are looking for it to be cool and a thick liquid.
Place blueberries on the whipped cream/cream cheese layer. They won't totally cover, you just want them to be evenly spaced.
Gently pour cooled jello on this layer.
Refrigerate until firm and set.
Optional garnish is some leftover whipped cream, blueberries and a pretzel.
Nutrition (I am not a nutritionist. These are estimates only)