Texas sheet cake cupcakes are a twist on the decadent and chocolatey Texas sheet cake. They're rich, sweet, and have gooey chocolate fudge icing on top.
Preheat oven to 350 degrees Fahrenheit. Line muffin pans with 24 cupcake liners.
In an electric mixer with paddle attachment or a large mixing bowl with a hand mixer, combine butter, eggs, vanilla, and white sugar.
In a saucepan on the stove or in a microwave-safe dish in the microwave, heat water to almost a simmer. Add cocoa powder and whisk until it has dissolved all of the powder with no lumps left. Add to the mixing bowl and blend well. Add sour cream and mix.
Sift together all of the dry ingredients, then slowly add to the mixing bowl.
Fill each cupcake liner with 3 tablespoons of cupcake batter. Bake in the oven for 16-20 minutes until the tops spring back when lightly touched.
Chocolate Icing
In an electric mixer with a whisk attachment or a large mixing bowl with a hand mixer, combine butter, milk, cocoa powder, and vanilla. Slowly add 1 cup of confectioners' sugar at a time until well blended.
Ice cupcakes once they have fully cooled. Add chopped pecans on top of icing if desired.