Grandma’s Oatmeal Cake

Instructions

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1. 1 In a small bowl, pour the boiling water over the oatmeal and stir to combine. Let it sit until the water is absorbed and the oatmeal is cool, about 25 minutes.
2. 2 Spray a 9x13-inch cake pan with cooking spray and set aside.
3. 3 Stir the flour, cinnamon, baking soda, and salt together in a medium bowl and set aside.
4. 4 Mix the butter, sugar, and brown sugar in the bowl of a stand mixer on low, slowly increasing the speed to medium-high until well combined and uniform in color and texture, about 3 minutes. Stop the mixer and scrape down the bowl halfway through the mixing time. Note that the mixture doesn’t lighten in color or get completely creamy. Turn the mixer down to low and add the eggs one at a time. Mix until incorporated, about 20 seconds before adding the next egg. Stop the mixer and scrape down the bowl, then mix on medium-low for another 20 seconds to ensure the batter is emulsified. Add the vanilla extract and mix to combine.
5. 5 Add the room-temperature oatmeal to the batter and mix on medium to combine. Once combined, turn off the mixer and add the flour and spices. Mix on low until a few streaks of flour remain, then stop the mixer and scrape the bowl a couple of times with a flexible spatula and make sure the batter is fully mixed.
6. 6 Scrape the batter into the prepared pan and spread it evenly with a flexible spatula. Bake until the sides start to pull away from the pan, the middle of the cake springs back when gently pressed, and a toothpick comes out clean, about 25 minutes.
7. 7 In a 2-quart saucepan, melt the butter on medium-low. Once melted, add the brown sugar, white sugar, milk, and salt and combine using a flexible spatula. Increase the heat to medium and continue stirring and scraping the sides and bottom of the pan. When bubbles reach the top of the mixture, stop stirring and boil for exactly 1 minute. Set a timer!
8. 8 Once the frosting has boiled for 1 minute, scrape it into a large heat-proof bowl. Let it cool until the cake is out of the oven (about 15 minutes). Then use a whisk to whip the frosting until it’s thick and no liquid pools in the trails left by the whisk. How cool the mixture is will determine how long it takes to whip it, but it usually only takes 1 to 2 minutes. The frosting will be light tan in color.
9. 9 Scrape the frosting over the warm cake. Use an offset spatula to spread the frosting evenly over the top. This is not a cake for perfectionists. The frosting sets quickly and will lose its shine if you repeatedly smooth the same areas (I’ve learned this the hard way!) so spread it and walk away. Place the cake on a cooling rack and let cool completely before cutting and serving, about 1 to 2 hours. Cover any leftover cake in plastic wrap or store in an airtight container and leave on the counter. The cake will last for 4 to 5 days. Love the recipe? Leave us stars and a comment below!