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Pan of Old Fashioned Oatmeal Cake on a white table from overhead.
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5 from 1 vote

Old Fashioned Oatmeal Cake

Old Fashioned Oatmeal Cake is a hearty and moist cake made with rolled oats, then baked, topped, and broiled with a rich, nutty coconut frosting. Enjoy a piece for breakfast with a cup of coffee (hey, there are oats in it!) or as a snack or dessert. This cake, also known as a Lazy Daisy Oatmeal Cake, can be enjoyed anytime!
Prep Time20 minutes
Cook Time33 minutes
Total Time53 minutes
Course: Dessert
Keyword: Old Fashioned Oatmeal Cake
Servings: 12 pieces
Calories: 453kcal
Author: Amanda Rettke--iambaker.net

Ingredients

Cake

  • 1 cup (90 g) old-fashioned oats
  • 1 ¼ cups boiling water
  • ½ cup (1 stick / 113 g) unsalted butter, room temperature
  • ½ cup (100 g) granulated sugar
  • ½ cup (100 g) light brown sugar, lightly packed
  • 2 large eggs, room temperature
  • 1 teaspoon vanilla extract
  • 1 ⅓ cups (167 g) all-purpose flour
  • 1 teaspoon baking soda
  • 1 teaspoon ground cinnamon
  • ¼ teaspoon kosher salt

Frosting

  • 6 tablespoons unsalted butter, melted
  • 1 cup (200 g) light brown sugar, packed
  • ¼ cup (60.5 g) half and half
  • 1 teaspoon vanilla extract
  • 1 ½ cups (139.5 g) sweetened coconut flakes
  • 1 ½ cups (175.5 g) chopped walnuts

Instructions

  • Preheat oven to 350°F. Spray a 9x13-inch baking dish* with non-stick cooking spray. Set aside.
  • To a small bowl, add oats and boiling water. Stir to combine. Set aside while you prepare the rest of the ingredients.
  • To the bowl of a stand mixer fitted with the paddle attachment, add the butter and both sugars. With the mixer on low speed, cream until combined.
  • Add eggs, one at a time, mixing well between each addition. Add vanilla. Mix well.
  • To a medium bowl, add flour, baking soda, cinnamon, and salt. Whisk to combine.
  • Add the flour mixture to the creamed butter and sugar. Mix well. Add oat mixture. Mix until just combined.
  • Pour batter into the prepared baking dish.
  • Bake for 30-35 minutes, or until a toothpick inserted comes out with a few crumbs, but no wet batter.

Frosting

  • To a medium bowl add butter, brown sugar, half and half, vanilla, coconut, and walnuts. Stir to combine. Evenly spread over the hot oatmeal cake.
  • Place the frosted cake under the broiler for 3-4 minutes, or until the nuts are toasted, watching carefully to prevent burning.
  • Serve warm or at room temperature.

Video

Notes

*Be sure the baking dish you are using is broiler-safe; the cake with frosting will be going under the broiler for a few minutes.

Nutrition

Serving: 1piece | Calories: 453kcal