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Pumpkin Spice Cake Bars with Vanilla Buttercream Frosting

Taralynn
These Pumpkin Spice Cake Bars with Creamy Vanilla Buttercream are the perfect fall dessert! Incredibly moist, perfectly spiced, and easy to make—no mixer needed. Chill before serving for the best flavor!
5 from 2 votes
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Prep Time 15 minutes
Cook Time 30 minutes
Course Dessert
Servings 12 Bars

Ingredients
  

Pumpkin Cake Bars
  • 15 Ounces Pumpkin Puree
  • 3 Large Eggs
  • 2/3 Cup Butter (melted)
  • 1 Cup Sugar
  • 1/2 Cup Brown Sugar (packed)
  • 3 Tablespoons Vanilla
  • 1 1/2 Cups All-Purpose Flour
  • 1 Teaspoon Baking Powder
  • 1 Teaspoon Baking Soda
  • 1 Tablespoons Ground Cinnamon
  • 2 Teaspoons Pumpkin Spice
  • 2 Teaspoons Allspice
  • 1/2 Teaspoon Cloves
  • 1/2 Teaspoon Ginger
  • 1 Teaspoon Sea Salt
Vanilla Buttercream Frosting
  • 4 to 5 Cups Powdered Sugar
  • 1/2 Cup Milk I used whole
  • 1/4 Cup Melted Butter
  • 2 Tbsps Vanilla

Instructions
 

Pumpkin Cake Bars

  • Preheat the oven to 350°F.
    In a large mixing bowl, whisk the eggs until well beaten. Add the pumpkin purée, sugar, brown sugar, vanilla, and melted butter, then slowly pour in the melted butter while mixing until fully combined.
  • Sift together the flour, baking powder, baking soda, sea salt, pumpkin pie spice, allspice, cinnamon, cloves, and ginger.
  • Gradually add the dry ingredients to the wet mixture, stirring until everything is well incorporated and smooth.
  • Line a 9×13-inch glass baking dish with parchment paper (I like to spray both the parchment paper and edges of the dish with cooking spray). Evenly pour the batter into the prepared dish.
  • Bake for 30–35 minutes, or until a toothpick inserted in the center comes out clean. Be careful not to overbake—the cake will continue to cook slightly as it cools. Let it cool completely before spreading on the vanilla buttercream.

Vanilla Buttercream Frosting

  • Melt the butter in a small saucepan or microwave-safe bowl.
  • In a large mixing bowl, combine the powdered sugar, milk, vanilla, and melted butter. Mix well using a whisk or spatula until smooth and creamy.
    If the frosting is too runny, add a bit more powdered sugar until it thickens.If it’s too thick, add a splash more milk until you reach your desired consistency.
  • Once the bars are completely cooled, pour the vanilla buttercream frosting over the top and spread it evenly with a spatula. For a festive touch, add some cute fall sprinkles or a light dusting of cinnamon on top.
  • Place the bars in the refrigerator to chill before slicing.
Keyword fall dessert, baking, pumpkin spice bars, frosted pumpkin bars, pumpkin cake, fall dessert recipe, moist cake bars, frosted pumpkin cake, fall recipes
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