Lemon Texas Sheet Cake is a fluffy, moist cake that's tangy-sweet with a burst of citrusy flavor in every bite. It's like a slice of sunshine on a plate. Enjoy by yourself or for a crowd!
Preheat oven to 350 degrees. Prepare a half sheet pan (18x13x1) or jelly roll pan
Combine flour, granulated sugar, salt, baking soda, and lemon zest in a large mixing bowl.
In a small saucepan, add water, lemon juice, and two sticks of butter over medium heat until boiling.
Pour the wet ingredients into flour mixture, in the mixer bowl, and mix until combined. Scrape down the sides or bottom, as needed.
Add sour cream and eggs.
Spread cake batter into the prepared sheet pan. Bake for 18-20 minutes or the cake is slightly pulling away from the sides, is light brown and toothpick tests clean.
Make the frosting while the cake is still warm. Combine 2 cups of powdered sugar, salt, sour cream, lemon juice, lemon extract, and butter.
Add the rest of the powdered sugar and mix. Spread frosting evenly over top of the cake, while it is still warm.
Sprinkle extra lemon zest on top to add more lemon flavor and to make it pretty, if desired. Allow frosting to set about 15-20 minutes, then cut and enjoy!