Published: September 12, 2025
Holiday Sugar Plum Baked Oatmeal with Crumble Topping
This Holiday Sugar Plum Baked Oatmeal is perfect for a festive morning or plum season. It started when I had 2 lbs of Italian plums from a local farmer. During my baked oatmeal phase, I realized a fruit crumble could become breakfast.
Why You Will Love This Recipe
Equipment
- 9×9-inch baking dish – greased with butter or oil so the oatmeal doesn’t stick.
- Large mixing bowl – for combining the oats and spices.
- Medium mixing bowl – for whisking wet ingredients.
- Whisk – to beat eggs and blend liquids smoothly.
- Measuring cups and spoons – for accuracy, especially with spices.
- Fork or pastry cutter (optional) – to cut the butter into the crumble topping. I actually just use my fingers.
Ingredients You Will Need
The Base
- Rolled oats (160 g / 2 cups): The heart of baked oatmeal! Use old-fashioned oats for the best texture.
- Fairlife 2% milk (480 ml / 2 cups): Adds creaminess, extra protein!
- Eggs (100 g / 2 large): Help bind everything together while adding more protein.
- Melted Butter or coconut oil (42 g / 3 tbsp): Adds richness and moisture.
Sweeteners & Flavor
- Coconut sugar (67 g / ⅓ cup): Natural sweetness with a caramel-like note.
- Vanilla extract (10 ml / 2 tsp) + almond extract (1 ml / ¼ tsp): A festive, cookie-like combo. Tip: You can measure this ingredient with love!
Warm Spices
- Cinnamon (2.5 g / 1 tsp), ginger (2 g / ½ tsp), nutmeg (1 g / ¼ tsp), cloves (pinch): Together, these turn everyday oatmeal into a Christmas breakfast. Optional to just use cinnamon.
Nutrient Boosters
- Ground flaxseed (14 g / 2 tbsp) + chia seeds (20 g / 2 tbsp): Extra fiber, healthy fats, and a little crunch.
- Nuts or seeds (60 g / ½ cup, optional): Almonds, walnuts, or pumpkin seeds add protein and texture.
The Fruit
- Plums (480 g / 3 cups, diced): Juicy, tart-sweet, and the star of this “sugar plum” breakfast. I use Italian plums I got from a friend’s tree!
Crumble Topping
- Flour (60 g / ½ cup) + coconut sugar (50 g / ¼ cup): The base of a sweet, golden topping.
- Cold butter (42 g / 3 tbsp): Creates the perfect crumbly texture for your crumble.
- Cinnamon (1 g / ¼ tsp, optional): For extra warmth and crunch.
Step-by-Step Instructions with Recipe Tips
Preheat and prepare
Preheat oven to 375°F (190°C). Grease an 9×9-inch baking dish with butter or oil.
Mix the dry ingredients
In a large mixing bowl, combine oats, baking powder, cinnamon, ginger, nutmeg, cloves, salt, coconut sugar, flax, and chia.
Whisk the wet ingredients
In a medium bowl, whisk together the milk, eggs, vanilla, and melted butter.
Tip: Let the butter cool slightly before whisking to prevent scrambling the eggs.
Combine wet and dry
Pour the wet mixture into the dry mixture and stir until combined.
Add fruit and nuts
Fold in the diced plums and nuts (if using). Pour the batter into the prepared baking dish.
Tip: Cut the plums into perfect bite sized pieces to avoid cumbersome chunks of plums.
Make the crumble topping
In a small bowl, combine flour, coconut sugar, cinnamon. Cut in the cold butter with a fork or your fingers until the mixture resembles coarse crumbs.
Tip: Don’t overmix! Look for Small pea-sized clumps for the best topping.
Assemble and bake
Sprinkle the crumble evenly over the oatmeal. Bake for 40–45 minutes, until golden brown and set in the center.
Tip: If the top is browning too quickly, cover loosely with foil during the last 10 minutes. I didn’t need to do this but everyone’s oven is different.
Cool and serve
Allow to cool for 10–15 minutes before slicing.
Serve warm, dusted with powdered sugar if you want a snowy holiday finish!
Recipe Variations
Serving Suggestions
Storage & Reheating Tips
Refrigerator:
- For longer storage, keep leftovers in the fridge for up to 5 days. Reheat individual slices in the microwave for 30–45 seconds or warm in the oven at 325°F (160°C) for 10 minutes.
Freezer:
- Slice into squares, wrap each piece tightly in plastic wrap or foil, and place in a freezer bag. Freeze for up to 6 months. Thaw overnight in the fridge, then reheat before serving.
Meal Prep Pro Tip:
- Portion into single-serve containers with a spoonful of yogurt or nut butter on the side for an easy grab-and-go breakfast.
More Healthy and Healthy-ish Dessert Recipes
The Easiest Homemade Strawberry Rhubarb Crisp
Easy Healthy Snickers Dates (Chocolate Covered Date Bites)
Homemade White Chocolate Macadamia Nut Clif Bar
Easy Peach Bread Recipe Made with Less Sugar
Plum Baked Oatmeal with a Crumble Topping
Equipment
- 9x9 inch cake pan
- Large Mixing Bowl
- Medium Mixing Bowl
- Whisk
- measuring cups and spoons
- rubber spatula
Ingredients
- 2 cups old-fashioned rolled oats 160g
- 2 tbsp ground flax
- 2 tbsp chia seeds
- 1 tsp ground cinnamin
- ½ tsp ground ginger
- ¼ tsp nutmeg
- ⅕ tsp ground cloves
- ½ tsp kosher salt
- 2 cup 2% milk
- 2 eggs
- ⅓ cup coconut sugar
- 2 tsp vanilla extract
- 3 tbsp melted butter
- 3 cups plums, diced 480g
- ½ cup walnuts
Crumble Topping
- ½ cup all-purpose flour 60g
- ¼ cup coconut sugar 50g
- ¼ tsp ground cinnamon
- 3 tbsp cold butter, cubes
Instructions
- Preheat oven to 375°F (190°C). Grease an 8x8-inch (20x20 cm) baking dish.
- In a large bowl, mix oats, baking powder, cinnamon, ginger, nutmeg, cloves, salt, coconut sugar, flax, and chia.
- In another bowl, whisk together 2% milk, eggs, vanilla, and melted butter.
- Pour wet ingredients into the dry and stir to combine.
- Fold in the diced plums and nuts (if using). Spread mixture evenly into the prepared dish.
- In a small bowl, combine flour, coconut sugar, and cinnamon. Cut in the cold butter with a fork or your fingers until coarse crumbs form.
- Sprinkle crumble evenly over the oatmeal mixture.
- Bake for 40–45 minutes, until golden brown on top and set in the center.
- Cool slightly before slicing into squares. Dust with powdered sugar before serving, if desired.
Nutrition
Hi, I’m Sarah Harper, a Registered Dietitian Nutritionist passionate about cooking, eating, and sharing all things food! At The Addy Bean, you’ll find a variety of flexitarian recipes designed to inspire and empower you to explore the delicious world of plant-based eating. My mission is to make plant-forward meals approachable, enjoyable, and part of your everyday life!
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