Using a mixer, beat the cold evaporated milk (or heavy whipping cream) until fluffy. Set aside.
In a separate bowl, beat cream cheese, sugar, and lemon juice with mixer until smooth. Pour the slightly thickened lemon Jell-O and beat really well. Add the whipped evaporated milk and mix until combined.
Spread filling evenly over the crust and sprinkle 1 cup of graham cracker crumbs over the top.
Chill at least 2 hours, it should be well set, then slice and serve. Cover when storing in the refrigerator.
