It brings back so many memories.

This cake would be sitting on the counter every time we visited her.

In between playing outside and ping pong, Id enjoy a slice of oatmeal cake.

baking dish with Grandma’s Oatmeal Cake, slices cut and one slice on a metal spatula with plates for serving

Simply Recipes / Photo by Julia Gartland / Food Styling by Pearl Jones

What is penuche frosting?

Thats when I discovered that this wasn’t a cake reserved for company.

Grandma would make it a couple of times a month.

slice of Grandma’s Oatmeal Cake on a plate with a fork

Simply Recipes / Photo by Julia Gartland / Food Styling by Pearl Jones

Every time one appeared, I would nibble on it all week long.

Its the perfect accompaniment to an afternoon cup of coffee or tea.

Since this is a family favorite, I didnt stray far from the original.

slices of Grandma’s Oatmeal Cake on dessert plates with forks and glasses of milk

Simply Recipes / Photo by Julia Gartland / Food Styling by Pearl Jones

The only changes I made were to use old-fashioned oatsinstead of quick oatsand remove corn syrup from the frosting.

Let it sit until the water is absorbed and the oatmeal is cool, about 25 minutes.

Simple Tip!

baked cake in a 9x14 baking dish for Grandma’s Oatmeal Cake

Simply Recipes / Photo by Julia Gartland / Food Styling by Pearl Jones

After about 15 minutes have gone by, carry on with the recipe.

The oats should be cooled by the time they are added.

Spray a 9x13-inch cake pan with cooking spray and set aside.

butter and brown sugar mixture bubbling in a saucepan with a spatula for Grandma’s Oatmeal Cake

Simply Recipes / Photo by Julia Gartland / Food Styling by Pearl Jones

Stir the flour, cinnamon, baking soda, and salt together in a medium bowl and set aside.

Stop the mixer and scrape down the bowl halfway through the mixing time.

Note that the mixture doesnt lighten in color or get completely creamy.

whipped caramel frosting in mixing bowl with a whisk mixer attachment for Grandma’s Oatmeal Cake

Simply Recipes / Photo by Julia Gartland / Food Styling by Pearl Jones

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.

Add the vanilla extract and mix to combine.

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.

Scrape the batter into the prepared pan and spread it evenly with a flexible spatula.

In a 2-quart saucepan, melt the butter on medium-low.

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.

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).

The frosting will be light tan in color.

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.

so spread it and walk away.

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.

Leave us stars and a comment below!