Preheat oven to 375°F (190°C) and grease the bottom of a 13x9 inch baking dish with 1 tablespoon softened butter.
Melt ¾ cup salted butter in a microwave-safe bowl by heating in 30-second increments until fully melted.
Mix the melted butter with crushed pretzels and 3 tablespoons sugar until well combined.
Press the pretzel mixture evenly into the bottom of the prepared baking dish using a measuring cup for smoothness.
Bake the crust for 10 minutes, then remove and cool completely.
Beat cream cheese and ¾ cup sugar with a hand mixer until light and fluffy, scraping the bowl sides as needed.
Add vanilla extract and lemon juice to the cream cheese mixture and beat until combined.
Gently fold in the thawed Cool Whip until no streaks remain.
Spread the cheesecake layer evenly over the cooled pretzel crust and refrigerate for at least 1 hour.
In a large bowl, dissolve raspberry Jell-O in 2 cups boiling water, then stir in the whole berry cranberry sauce until combined.
Chill the cranberry mixture in the refrigerator until it thickens and is slightly set.
Spoon the cranberry Jell-O layer over the cheesecake layer and refrigerate until firmly set, at least 5 hours or overnight.