Combine blueberries, sugar, lemon juice and vanilla in a saucepan - cook over medium heat, stirring until comes to slow boil. Boil for 2-3 minutes
Combine corn starch and water throughly, after blueberries have boiled remove from heat and slowly drizzle in while stirring the corn starch mixture. Set aside to cool
Can be made ahead of time and stored in refrigerator
Pretzel Layer
Crush 2 cups of pretzels, stir in melted butter and sugar
Press mixture into a 9x13 dish, bake for 8-10 minutes in a 350° pre-heated oven
Allow to cool completely before assembling
Cream Cheese Layer
With electirc mixer combine cream cheese and powdered sugar until fluffy
Fold in Cool Whip
Assembly
Carefully spread the Cream Cheese Layer on top of the pretzel crust once it has cooled - be sure to get all the way up to the edges of the pan!
Spread cooled blueberry mixture on top of chream cheese layer
Store in refrigerator until time to serve - great dish to make ahead as the colder the better!
Nutrition values are estimates, for exact values consult a nutritionist.