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Ultimate Comforting Family Reunion Sheet Cake with Easy Chocolate Fudge Frosting

family reunion sheet cake - featured image

A rich, moist chocolate sheet cake topped with a thick, luscious chocolate fudge frosting, perfect for family gatherings and celebrations. This easy-to-make recipe uses simple pantry staples and delivers comforting, indulgent flavor.

Ingredients

Scale
  • 2 ½ cups all-purpose flour (315g)
  • 2 cups granulated sugar (400g)
  • ¾ cup unsweetened cocoa powder (75g), sifted
  • 1 ½ teaspoons baking powder
  • 1 teaspoon baking soda
  • ½ teaspoon salt
  • 3 large eggs, room temperature
  • 1 cup buttermilk (240ml)
  • ½ cup vegetable oil (120ml)
  • 2 teaspoons vanilla extract
  • 1 cup hot water (240ml), about 130-140°F (55°C)
  • 1 cup unsalted butter (225g), melted and slightly cooled
  • ½ cup unsweetened cocoa powder (50g), sifted
  • 3 ½ cups powdered sugar (440g), sifted
  • ⅓ cup whole milk (80ml) or dairy-free milk alternative
  • 1 teaspoon vanilla extract
  • Pinch of salt

Instructions

  1. Preheat oven to 350°F (175°C). Grease a 9×13 inch sheet pan with butter or non-stick spray and lightly dust with flour or cocoa powder.
  2. In a large bowl, sift together flour, granulated sugar, cocoa powder, baking powder, baking soda, and salt. Whisk to combine.
  3. In another bowl, beat eggs, then add buttermilk, vegetable oil, and vanilla extract. Mix until smooth.
  4. Slowly add wet ingredients to dry ingredients, stirring gently until just combined. Do not overmix.
  5. Carefully stir in hot water until batter is smooth and thin.
  6. Pour batter into prepared pan and smooth the top. Bake for 35 to 40 minutes or until a toothpick inserted near the center comes out clean or with moist crumbs.
  7. Cool cake in pan on a wire rack for about 30 minutes, then remove from pan and cool completely before frosting.
  8. To make frosting, melt butter over low heat. Remove from heat and whisk in cocoa powder until smooth.
  9. Transfer to a large bowl and stir in powdered sugar alternately with milk until desired consistency is reached.
  10. Add vanilla extract and a pinch of salt. Beat with mixer or whisk until fluffy and spreadable.
  11. Spread frosting evenly over cooled cake using an offset spatula or back of a spoon.
  12. Slice into squares and serve. Best enjoyed the day it’s made but keeps well covered at room temperature for 2 days or refrigerated up to 5 days.

Notes

Sift cocoa powder and powdered sugar for smooth frosting. Do not frost cake while warm to prevent melting. Add hot water to batter for moist texture. Frosting can be made ahead and chilled. For gluten-free, substitute flour with 1-to-1 gluten-free blend. For dairy-free, use almond milk with lemon juice and coconut oil instead of butter.

Nutrition

Keywords: chocolate sheet cake, family reunion cake, chocolate fudge frosting, easy chocolate cake, crowd-pleaser dessert, moist chocolate cake, sheet cake recipe