This old fashioned oatmeal cake is a soft, spiced sheet cake made with quick oats and brown sugar, topped with a warm coconut and pecan frosting.
Oats soak in boiling water first, which makes the crumb moist and tender. The topping cooks in minutes on the stovetop, then spreads over the cooled cake and sets into a chewy, nutty layer.
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Why This Old Fashioned Oatmeal Cake Recipe Works
Soaking the oats softens them completely, so they melt into the batter and keep the cake moist for days. Brown sugar adds a deep molasses flavor, while cinnamon, nutmeg, and apple pie spice add gentle warmth.
The frosting is cooked briefly with butter, cream, and sugar, then loaded with toasted coconut and pecans. A touch of lemon juice balances the sweetness and keeps the topping from tasting flat.
Ingredients for Old Fashioned Oatmeal Cake
- 1 cup quick oats
- 1/2 cup unsalted butter, room temperature
- 1 1/4 cups boiling water
- 1 1/3 cups all purpose flour
- 1 teaspoon baking soda
- 1/2 teaspoon kosher salt
- 1/4 teaspoon freshly grated nutmeg
- 1 teaspoon apple pie spice
- 1 teaspoon ground cinnamon
- 1 cup granulated sugar
- 1 cup dark brown sugar, packed
- 2 large eggs, room temperature and lightly beaten
- 6 tablespoons unsalted butter for the frosting
- 1/4 cup heavy cream
- 1/2 cup granulated sugar for the frosting
- 1 pinch kosher salt for the frosting
- 1/2 cup sweetened shredded coconut, toasted
- 1 cup chopped pecans, toasted
- 1 teaspoon pure vanilla extract
- 1 tablespoon fresh lemon juice
Quick oats. They soften fast in boiling water and give the cake a tender, slightly chewy crumb.
Brown sugar. Dark brown sugar adds moisture and a deep caramel flavor that suits the spices.
Baking soda. It reacts with the brown sugar and helps the cake rise evenly in the pan.
Toasted pecans and coconut. Toasting brings out their flavor and keeps the topping from tasting raw.
Lemon juice. A small splash cuts through the sweetness of the frosting.
How to Make Old Fashioned Oatmeal Cake
1. Prepare the pan Heat the oven to 350 degrees F and grease a 9×13 inch baking dish.
2. Soak the oats Stir the quick oats into the boiling water and let them sit until the water is absorbed.
3. Cream the butter Beat the 1/2 cup butter with the granulated and brown sugars until fluffy, then mix in the eggs.
4. Whisk the dry mix Whisk the flour, baking soda, salt, nutmeg, apple pie spice, and cinnamon together in a separate bowl.
5. Combine the batter Add the dry mix to the butter mixture in two parts, alternating with the soaked oats, until just combined.
6. Bake the cake Spread the batter in the dish and bake 30 to 35 minutes, until a toothpick comes out clean.
7. Cook the frosting Melt the butter in a saucepan, stir in the cream, sugar, and salt, and boil for 2 minutes.
8. Finish and spread Remove from the heat, stir in the coconut, pecans, vanilla, and lemon juice, and spread over the cooled cake.
How to Serve Old Fashioned Oatmeal Cake
Cut the cake into 12 squares and serve warm or at room temperature with coffee or tea. A slice pairs well with cinnamon streusel coffee cake for a brunch spread, or with a small bowl of baked cinnamon rice pudding for a relaxed family dessert. For a bake sale table, add moist vanilla cake and Greek yogurt banana bread so there is something for every taste.
How to Store and Reheat Old Fashioned Oatmeal Cake
Cover the cake and keep it at room temperature for up to 2 days, or refrigerate it for up to 4 days. Bring slices to room temperature before serving for the softest texture. To freeze, wrap squares tightly and store for up to 3 months, then thaw at room temperature. A quick 10 second warm up in the microwave brings back a freshly baked feel.
Tips and Variations for Old Fashioned Oatmeal Cake
Toast the extras. Toast the coconut and pecans in a dry skillet for 3 to 4 minutes until fragrant.
Let the cake cool. Spread the frosting only after the cake cools, so it sets as a distinct layer.
Grate fresh nutmeg. Freshly grated nutmeg tastes warmer than the jarred kind.
Pack the sugar. Press the brown sugar firmly into the cup for accurate measuring.
Test early. Check the cake at 30 minutes, since ovens vary.
Add raisins. Fold 1/2 cup raisins into the batter for a classic variation.
Use a lined pan. Parchment overhang makes it easy to lift the cake out in one piece.
Store safely. Keep cake with a cooked topping covered and follow the Texas AgriLife Extension food safety guide for handling advice.
Frequently Asked Questions About Old Fashioned Oatmeal Cake
What makes old fashioned oatmeal cake so moist?
Soaking the oats in boiling water softens them fully, and brown sugar holds moisture in the crumb.
Can I make old fashioned oatmeal cake ahead of time?
Yes. Bake it a day ahead and add the frosting the next day, or serve it as is.
Can I freeze old fashioned oatmeal cake?
Yes. Wrap squares tightly and freeze for up to 3 months, then thaw at room temperature.
Can I use rolled oats instead of quick oats?
Yes, but chop them briefly in a food processor and soak them a few minutes longer so the cake stays tender.
Can I skip the coconut?
Yes. Use extra pecans or add chopped walnuts for the same crunch.
Old Fashioned Oatmeal Cake with Coconut Pecan Frosting
Equipment
- 9×13 inch baking dish
- Mixing bowls
- Saucepan
- Electric mixer
Ingredients
Main Ingredients
- 1 cup quick oats
- ½ cup unsalted butter room temperature
- 1 ¼ cup boiling water
- 1 ⅓ cup all purpose flour
- 1 tsp baking soda
- ½ tsp kosher salt
- ¼ tsp freshly grated nutmeg
- 1 tsp apple pie spice
- 1 tsp ground cinnamon
- 1 cup granulated sugar
- 1 cup dark brown sugar packed
- 2 large eggs room temperature, lightly beaten
- 6 tbsp unsalted butter for the frosting
- ¼ cup heavy cream
- ½ cup granulated sugar for the frosting
- 1 pinch kosher salt for the frosting
- ½ cup sweetened shredded coconut toasted
- 1 cup chopped pecans toasted
- 1 tsp pure vanilla extract
- 1 tbsp fresh lemon juice from 1/2 lemon
Instructions
Cooking
- Soak the oats. Pour the boiling water over the oats and let them stand 10 minutes. Heat the oven to 350 degrees F and grease a 9×13 inch dish.
- Cream the sugars. Beat the butter with both sugars until fluffy, then beat in the eggs one at a time.
- Mix the batter. Whisk the dry ingredients, then fold them into the creamed mixture in two additions with the soaked oats.
- Bake until golden. Spread in the dish and bake 30 to 35 minutes until a toothpick comes out clean. Cool 30 minutes.
- Boil the topping. Simmer the butter, cream, sugar, and salt for 2 minutes, then stir in coconut, pecans, vanilla, and lemon juice.
- Frost and cut. Spread the warm topping over the cooled cake and cut into 12 squares once it sets.
