01 -
Pre-heat your oven to 350°F (175°C). Line a 9 x 9 inch pan with parchment paper and leave a little hanging over the edges—it'll make it easy to pull the cake out later.
02 -
Combine the lemon zest with the sugar in a big bowl. Use your fingers to rub it in for about 20-30 seconds, which brings out the citrus oils and makes the flavor pop.
03 -
Drop the butter and oil into the sugar mix. With a mixer (stand or hand), whip on medium setting for 2 minutes until it's fluffy. Don’t forget to scrape the bowl! Add the eggs one by one, beating each time. Mix in the lemon juice and vanilla last, just until combined.
04 -
In a different bowl, stir together flour, baking powder, baking soda, salt, and poppy seeds. Add the dry mix to the wet ingredients in 3 turns, swapping between that and the sour cream and milk. Start and finish with the dry mix. Be sure to stir gently!
05 -
Scoop the batter into the prepped pan, spreading it out evenly with an offset spatula.
06 -
Bake for 30-35 minutes, keeping an eye on the color. When a toothpick poked in the middle comes out clean, it’s done. If it’s browning too fast, tent it with foil. Take care not to overbake!
07 -
Let the cake sit in the pan for 30-45 minutes. Grab the parchment to lift it out and place it on a cooling rack. It’s best to let it cool all the way before adding the glaze.
08 -
In a small bowl, stir powdered sugar with milk or lemon juice until smooth. Add a bit of vanilla if you like. Pour the glaze over the cooled cake to finish.