Old-Fashioned Oatmeal Cake with Coconut Pecan Frosting
This old-fashioned oatmeal cake is one of those desserts that turns a humble breakfast staple into something you’d happily serve at the end of a holiday meal. The crumb is tender and just sweet enough to let the topping shine, and the whole thing comes together in about an hour.
What really grabs people, though, is the broiled coconut pecan frosting. It puffs and bubbles under the heat, getting crisp along the edges while the brown sugar glaze sinks into the warm cake just a little.
Why This Oatmeal Cake Always Gets Asked For
Soaking rolled oats in hot water might sound plain, but it’s what gives the cake its soft, almost creamy texture. You won’t taste oat pieces, just a moist crumb that stays fresh for days.
The frosting is the real reason I keep this recipe close. Broiling it creates toasted pecan bits, chewy coconut shreds, and a thin, caramelized crust that cracks when you cut into a slice.
Ingredients
- 1 cup old-fashioned rolled oats: not instant or steel-cut; they provide structure without turning mushy
- 1 1/4 cups boiling water: to soften the oats quickly
- 1/2 cup unsalted butter, softened: pull it from the fridge about an hour ahead
- 1 cup granulated sugar
- 1 cup packed light brown sugar: dark brown works too, with a stronger molasses note
- 2 large eggs
- 1 tsp vanilla extract
- 1 1/2 cups all-purpose flour
- 1 tsp baking soda
- 1/2 tsp salt
- 1/2 tsp ground cinnamon
- 1/4 tsp ground nutmeg
- 1/2 cup unsalted butter: for the frosting
- 1/2 cup packed light brown sugar
- 1/2 cup heavy cream or evaporated milk
- 1 cup sweetened shredded coconut
- 1 cup chopped pecans
- 1 tsp vanilla extract
Variations / Substitutions
- Swap the nuts: walnuts or sliced almonds work well; toast them lightly first for deeper flavor.
- Skip the coconut: you can replace it with an extra 1/2 cup chopped pecans for a praline-style topping.
- Add fruit to the batter: fold in 1/2 cup raisins or dried cranberries with the dry ingredients for a chewier cake.
- Make it gluten-free: a 1:1 cup-for-cup gluten-free flour blend usually works, but the cake may be slightly denser.
If you enjoy this cake, you might like a classic banana bread with sour cream for another simple, moist loaf.
How to Make Old-Fashioned Oatmeal Cake with Coconut Pecan Frosting
Step 1: Soak the Oats
Place the 1 cup rolled oats in a medium heatproof bowl and pour the 1 1/4 cups boiling water over them. Stir once, then let the mixture sit for 20 minutes while you gather the rest of the ingredients.
After 20 minutes, the oats will have absorbed most of the water and turned into a thick, porridge-like mash. That’s exactly what you want, so don’t drain it.
Step 2: Cream the Butter and Sugar
Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking pan. In a large mixing bowl, beat the 1/2 cup softened butter, 1 cup granulated sugar, and 1 cup packed brown sugar together with an electric mixer on medium speed until the mixture looks pale and fluffy, about 3 minutes.
Stop the mixer once or twice to scrape down the sides. Properly creamed butter and sugar will hold soft peaks and feel light when you lift the beater.
Step 3: Mix the Batter
Beat in the 2 eggs one at a time, then add the 1 tsp vanilla. Stir in the cooled oatmeal mixture by hand just until no streaks remain. In a separate small bowl, whisk together the 1 1/2 cups flour, 1 tsp baking soda, 1/2 tsp salt, 1/2 tsp cinnamon, and 1/4 tsp nutmeg. Add the dry ingredients to the wet mixture and fold gently with a spatula.
Stop folding as soon as the flour disappears. Overmixing develops gluten and will make the cake tough, so a few small lumps are fine.
Step 4: Bake the Cake
Scrape the batter into the prepared pan and spread it evenly with the spatula. Bake at 350°F (175°C) for 30 to 35 minutes, until the top springs back when pressed lightly and a toothpick inserted in the center comes out clean.
The cake will pull away from the sides of the pan just slightly. Let it cool in the pan on a wire rack for 5 minutes while you make the frosting; you want the cake still warm when you spread the topping.
Step 5: Top with Coconut Pecan Frosting and Broil
Combine the 1/2 cup butter, 1/2 cup brown sugar, and 1/2 cup heavy cream in a small saucepan over medium heat. Stir constantly until the butter melts and the mixture begins to bubble, then cook for 1 minute. Remove from the heat and stir in the 1 cup coconut, 1 cup pecans, and 1 tsp vanilla. Pour the warm frosting over the cake and spread it to the edges with the back of a spoon.
Place the pan under a preheated broiler, about 6 inches from the heat source, and broil for 2 to 3 minutes. Watch it the entire time: the topping will turn deep golden and bubble vigorously. Pull it out when the coconut tips just start to char. Slice and serve the cake warm or at room temperature, and the frosting will have a crisp, candy-like surface that crackles with each bite.
Tips for the Best Oatmeal Cake
- Use old-fashioned oats, not instant.: Instant oats will break down into a gummy layer, while rolled oats hold their shape just enough to keep the cake tender.
- Don’t skip the soaking step.: The 20-minute rest lets the oats hydrate fully and cool enough that they won’t scramble the eggs later.
- Broil with the oven door cracked open a couple inches.: This gives you a clear view and prevents the sugar from burning before you can react.
- Let the cake sit 10 minutes after broiling.: The topping will set and become easier to slice without pulling apart the top of the cake.
Bake times by pan:
| Pan Type | Bake Time |
|---|---|
| Metal 9×13-inch | 35 to 40 minutes |
| Glass 9×13-inch | 30 to 35 minutes |
Storing Leftover Oatmeal Cake
- Cover and keep at room temp: for up to 2 days. The frosting softens a little but still tastes great.
- Refrigerate: for up to 5 days in an airtight container. The cake stays moist, and the topping firms up.
- Reheat: a slice for 10 to 15 seconds in the microwave if you miss the warm, gooey frosting texture.
What Goes Well with This Cake
A scoop of good vanilla ice cream cuts the sweetness with its cold, milky richness and turns a slice into a full dessert. If you’re keeping it simple, a black coffee or a cold glass of milk balances the caramel notes without competing.
Frequently Asked Questions
Can I use quick oats instead of rolled oats?
Yes, but the cake will have a slightly softer, less distinct texture. Soak them for only 10 minutes since they absorb water faster.
Can I make this cake without the coconut?
Absolutely. Omit the coconut and increase the pecans to 1 1/2 cups for a pecan praline topping that broils just as well.
Is it okay to skip the broiling step?
You can, but the frosting won’t develop that crisp, candied top. Spread it on the warm cake and let it set at room temperature instead; it will be creamy rather than crunchy.
Can I freeze this cake?
Freeze the unfrosted cake, wrapped tightly, for up to 2 months. Thaw it, then make and broil the frosting fresh on the warm cake the day you plan to serve it.
Old-Fashioned Oatmeal Cake with Coconut Pecan Frosting Recipe
Ingredients
Method
- Soak the oats in boiling water for 20 minutes.
- Cream the butter and sugars with a mixer until pale and fluffy, about 3 minutes.
- Beat in eggs and vanilla, stir in the oats, then fold in the flour, baking soda, salt, cinnamon, and nutmeg until just combined.
- Pour batter into a greased 9×13-inch pan and bake at 350°F for 30–35 minutes until a toothpick comes out clean.
- Combine butter, brown sugar, and cream in a saucepan; cook 1 minute after bubbling, then stir in coconut, pecans, and vanilla. Pour over the warm cake and broil 6 inches from the heat for 2–3 minutes until golden and bubbling.
Notes
