We had the Kidlet's birthday party this past weekend. She requested cake pops rather than a regular cake, which actually worked out really well. That said, once we'd finished with the cake pops on Saturday, TF and I were both craving some sort of dessert that we could eat. So I quickly threw together this sheet cake as well.

Powdered buttermilk and frozen lemons meant that it was easy to make with ingredients on hand, without needing to do a special shop for supplies. And I also appreciated that the glaze can be added while the cake is still warm. (In theory, you're still supposed to wait for it to cool completely before you actually cut it, but at least the glaze can go on right away. And you can always cheat the timing on cutting it a bit in a way that you can't do with icing.)

I cut back the sugar a little bit for this one, but I was nervous about scaling it back too far because there's so little else in the cake to begin with. I omitted ~50g of sugar from the cake itself and maybe 40g from the glaze. I might've been able to reduce it a bit further, but I'd be wary of changing it too much more. This might just be one of those recipes that I enjoy sparingly and infrequently and just let it be an extra-rich treat when I do have it.

Lemon-Buttermilk Sheet Cake

Slightly adapted from The Perfect Cake by America's Text Kitchen

Ingredients

Cake

• 280g soft (plain/standard/cake) flour
• 1 tsp. baking powder
• 1/2 tsp. baking soda
• 1/4 tsp. coarse sea salt, ground
• 3/4 c. buttermilk
• 1/4 c. lemon juice
• 1 tsp. vanilla extract
• 300g sugar
• 3 Tbsp. lemon zest
• 3/4 c. unsalted butter, softened
• 3 large eggs
• 1 large egg yolk

Glaze

• 300g icing sugar
• 3-4 Tbsp. lemon juice
• 1 Tbsp. powdered buttermilk (or 1-2 Tbsp. regular buttermilk)

Directions

1. Preheat oven to 160°C (350°F) and grease and flour a 23x33cm (9x13") cake tin.
2. Sift together the flour, baking powder, and baking soda.
3. Mix in the salt and set aside.
4. Combine the buttermilk, lemon juice, and vanilla in a measuring cup and set aside.
5. Beat the sugar with the lemon zest until well-mixed and fragrant.
6. Separate out ~1/4 c. of the sugar and set aside.
7. Cream the butter into the remaining lemon sugar.
8. Beat in the eggs, one at a time, followed by the egg yolk.
9. Mix in the dry ingredients in three additions, alternating with the wet ingredients in two additions.
10. Give a final stir by hand and then pour the batter into the prepared tin.
11. Bake at 160°C (325°F) for 25-35 minutes.
12. Remove from oven and allow to cool for 10 minutes.
13. Meanwhile, make the glaze by mixing the icing sugar, lemon juice, and buttermilk powder (or buttermilk) together until it reaches a smooth, pourable consistency.
14. Pour the glaze over the cake, making sure it covers the entire surface.
15. Sprinkle with reserved lemon sugar and allow to cool completely before cutting into squares and serving.