Preheat oven to 375 °F. Spray a 9x13-inch casserole dish with nonstick spray.
In a large mixing bowl, whisk the eggs into the yogurt until fully beaten and incorporated.
Whisk in the sugar, lemon juice, lemon zest, vanilla extract, baking powder and salt.
Stir in the milk
Stir in the rolled oats
Pour the oatmeal mixture into the prepared casserole dish.
In a small bowl, mix together the cream cheese, 2 tablespoons of sugar and 1 teaspoon of lemon juice. Spread it on top of the oatmeal mixture as evenly as you can. I like to drop several dollops of cream cheese on top of the oatmeal and spread it around with a butter knife.
Put the casserole dish in the oven and bake for 45 minutes, until a skewer inserted into the center of the oatmeal comes out clean.