Step 1

Preheat the oven to 350F degrees.

Step 2

Grease and flour a 9x13 inch baking pan.

Step 3

In a large bowl beat together the butter and sugar until fluffy.

Step 4

Then beat in the eggs and vanilla.

Step 5

In a separate bowl whisk together the flour, cornstarch, baking powder, baking soda and salt.

Step 6

Using the electric mixer on low speed, beat about 1/2 of the sour cream into the butter mixture followed by about 1/2 of the flour mixture.

Step 7

Turn off the mixer and scrape down the sides of the bowl.

Step 8

Repeat the process with the rest of the sour cream and flour mixture.

Step 9

Fold in the lemon zest, lemon juice and poppy seeds using a large rubber spatula or wooden spoon.

Step 10

Pour the batter into the prepared pan and bake for 25-30 minutes, or until an inserted toothpick comes out clean

Step 11

Once the cake is cooled, make the frosting.

Step 12

In a large bowl, beat together the butter and cream cheese until evenly combined.

Step 13

Then slowly beat in the powdered sugar followed by the vanilla & lemon juice.

Step 14

Frost the cooked cake using a flat edge knife & serve