In a small bowl, beat together 1 large egg, 1/2 cup of sugar, 1/2 teaspoon of lemon juice, and 2 Tablespoons of sour cream for 2 minutes.
In a separate bowl on low speed beat together 1 cup of softened unsalted butter (2 sticks) with 1/2 teaspoon of baking soda and 2 1/2 cups of flour until everything is mixed. It will be clumpy from the butter, that is normal.
Combine the sugar and flour mixes together. With the help of your hands, mix the dough together until it forms into a ball. The dough will be soft and easy to work with.
Divide the dough in half. Take one half and place in the freezer for 15 minutes.
Preheat your oven to 350F. Spray or butter up your pan if you need to. (I use ceramic so it doesn’t stick.) You could also use a glass dish.
Take the other half of dough and spread it on the bottom of a half sized baking sheet.
On top of the dough spread 1 cup of jam.
After 15 minutes, take out the dough from the freezer and grate it onto the jam.
Put in oven for 20 minutes. The top will start to brown up, that means it’s ready!Let it cool down. Sift powdered sugar on top and cut into squares.