The Absolute Best Dark Chocolate Chocolate Chip Texas Sheet Cake

• CAKE
• 1 cup butter (cut into pieces, can use half butter and half margarine)
• 1 cup brewed strong coffee (hot or cold)
• 1/4 cup sifted unsweetened cocoa powder
• 2 cups white sugar, plus
• 2 tablespoons white sugar
• 2 cups flour
• 1/2 teaspoon salt
• 1 teaspoon baking soda
• 2 large eggs
• 3/4 cup sour cream
• 3 teaspoons vanilla
• 1 cup mini chocolate chip (can use a little more if desired)
• FROSTING
• 1/2 cup butter or 1/2 cup margarine, softened
• 2 2/3 cups confectioners' sugar
• 1/3 cup half-and-half cream or 1/3 cup unwhipped whipping cream
• 1 teaspoon vanilla
• 1/2 cup unsweetened cocoa powder (for a medium chocolate flavour) or 3/4 cup unsweetened cocoa powder (for a dark chocolate flavor)

1. Set oven to 350u0b0F (oven rack to second-lowest position).
2. Line bottom of a 17 x 11-inch jelly-roll pan with parchment paper.
3. For the cake; in a saucepan combine the butter with brewed coffee and sifted cocoa powder; bring to a boil then simmer for about 30 seconds, remove from heat then place in a large heat-proof or plastic bowl.
4. Add in sugar and vanilla whisk until all the sugar granules are dissolved; cool for about 20 minutes.
5. Whisk in eggs and sour cream together until well blended then add to the chocolate mixture; mix until blended.
6. In a small bowl mix together flour with baking soda and salt; add to the chocolate batter and mix until combined (batter will be thin).
7. Mix in chocolate chips.
8. Pour the batter into prepared jelly-roll pan.
9. Bake for about 18-20 minutes (watch closely this cake takes very little time to bake!).
10. Cool cake completely before slicing.
11. For the frosting; cream the butter in a medium bowl.
12. Add in desired amount of cocoa powder, vanilla and confectioners sugar and cream; beat using an electric mixer until desired consistancy is achieved (you may need additional cream or confectioners sugar).
13. Frost cooled cake.

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Taken from www.food.com/recipe/the-absolute-best-dark-chocolate-chocolate-chip-texas-sheet-cake-200484 (may not work)