Preheat the oven to 400 degrees F (200 degrees C).
2
Brush butter on the bottom and up the sides of two 5 1/2-ounce ramekins. Scoop in some sugar; rotate ramekins to coat while pouring most of the sugar back into its container. Place ramekins on a shallow baking pan.
3
Separate eggs between 2 bowls. Add sugar, flour, 1/4 teaspoon salt, vanilla extract, lemon zest, cream cheese, and Cheddar cheese to the yolks. Mix the souffle base with a spatula until sugar and flour disappear.
