Plum and Oat Breakfast Bake for Six Make-Ahead Mornings

Ripe September plums soften into a lightly sweet oat base in this practical breakfast bake, which makes six portions for busy mornings. Prepare it ahead, chill it thoroughly and serve each square with yoghurt, cottage cheese or another protein source. It is a convenient breakfast foundation rather than a miracle health food, and portions can be adjusted to suit individual energy and dietary needs.

By the GlobeBids Food & Recipes team · Updated September 9, 2026

Ingredients for six breakfast portions

Use a 20 cm square baking dish, or a similarly sized dish with a capacity of about 2 litres. A wider dish will produce thinner portions that cook faster, while a smaller, deeper dish may require extra baking time.

• 240 g rolled oats
• 2 teaspoons ground cinnamon
• 1 teaspoon baking powder
• 1/4 teaspoon fine salt
• 30 g pumpkin seeds or sunflower seeds
• 2 large eggs
• 500 ml milk or unsweetened fortified plant drink
• 2 tablespoons maple syrup or honey
• 1 teaspoon vanilla extract, optional
• 350 g ripe plums, weighed after removing the stones and cut into 2 cm pieces
• 1 teaspoon neutral oil or softened butter, for greasing

Choose traditional rolled oats rather than instant oats. Their larger flakes retain more structure during baking and reheating. If using a plant drink, check that it is suitable for the household’s allergy requirements and, where relevant, fortified with calcium and vitamin D.

The recipe uses only two tablespoons of sweetener because ripe plums contribute sweetness of their own. Very tart fruit may need a little more sweetness at the table, where it can be added to individual portions instead of the whole dish.

Mix the oats without making them gummy

Heat the oven to 180°C conventional, 160°C fan or 350°F. Lightly grease the baking dish and line its base with baking parchment if easy removal is important.

In a large bowl, combine the rolled oats, cinnamon, baking powder, salt and seeds. Separating the oat flakes before adding liquid helps the raising agent and seasoning spread evenly.

In a second bowl or large jug, whisk the eggs until the whites and yolks are fully blended. Whisk in the milk or fortified plant drink, maple syrup and vanilla. Pour this mixture over the oats and stir only until everything is moistened.

Leave the mixture to stand for 10 minutes. This gives the oats time to absorb some liquid without requiring vigorous mixing. Fold in about two-thirds of the chopped plums, then transfer the mixture to the prepared dish. Scatter the remaining fruit over the top.

Avoid blending the batter or repeatedly stirring it during the resting period. Breaking the flakes releases more starch, which can turn the finished bake pasty rather than tender.

Bake until the centre is set, not wet

Bake on the centre rack for 35 to 42 minutes. The surface should look lightly golden, the edges should be set and the centre should no longer ripple when the dish is moved gently.

Insert a thin knife into an oat-rich section near the centre rather than directly into a plum. It should emerge moist but without milky liquid or loose batter. A little fruit juice on the knife is normal. If the middle remains wet, bake for another 5 minutes and check again.

Place the dish on a wire rack and cool for at least 30 minutes before cutting. For neat meal-prep squares, cool completely, cover and refrigerate for at least 2 hours before dividing the bake into six portions. Cutting it while hot can compress the hydrated oats and create a gummy-looking centre even when it is properly cooked.

Adjust the liquid when plums are especially juicy

Plum varieties and ripeness levels make a noticeable difference. Firm-ripe plums generally hold their shape and release a moderate amount of juice. Very soft plums may collapse into the oats and produce a wetter, pudding-like result.

For exceptionally juicy fruit, use one of these adjustments:

• Pat the chopped plums gently with kitchen paper before weighing them.
• Reduce the milk or plant drink from 500 ml to 450 ml.
• Keep the fruit pieces about 2 cm wide instead of chopping them finely.
• Add up to 5 minutes to the baking time if the centre remains visibly loose.

Do not compensate by adding large amounts of extra oats after the mixture has rested. Dry oats added late hydrate unevenly and can leave hard patches. If the batter looks unusually wet before baking, stir in no more than 15 g of rolled oats and allow another 5-minute rest.

For a firmer bake, use 450 ml liquid even with moderately juicy plums. For a softer spoonable texture, retain the full 500 ml, but make sure the eggs are cooked and the centre is set before removing the dish from the oven.

Egg-free and nut-free variations

For an egg-free version, mix 2 tablespoons ground flaxseed with 5 tablespoons water and leave it for 10 minutes to thicken. Use this in place of the two eggs and reduce the milk or plant drink to 470 ml. The finished bake will be softer and less springy, so cool it completely before slicing.

A commercial egg replacer intended for baking can also work when prepared in an amount equivalent to two eggs. Follow its package directions because absorption differs between products. Egg-free versions may need an additional 5 minutes in the oven.

The core recipe can be nut-free when made with dairy milk or a plant drink explicitly labelled nut-free. Use pumpkin or sunflower seeds rather than chopped nuts, and check the labels on plant drinks, seeds and other packaged ingredients if cross-contact is a concern. Oat drinks are not automatically suitable for every allergy or gluten-related requirement.

For a gluten-free household, use rolled oats specifically certified gluten-free. Ordinary oats can encounter wheat, barley or rye during growing and processing.

Refrigerate, reheat or freeze individual portions

Once the bake has cooled completely, divide it into six portions and place them in a covered container. Refrigerate promptly and eat within four days. Do not leave the cooked bake at room temperature for more than two hours.

Reheat one refrigerated portion in the microwave until steaming hot throughout, usually 60 to 90 seconds depending on the appliance. Alternatively, cover it and warm it in a 170°C conventional oven for about 10 to 15 minutes. Add a small splash of milk before reheating if the oats have become firmer in the refrigerator.

To freeze, wrap fully cooled portions separately or place parchment between them in a freezer-safe container. Freeze for up to three months. Thaw overnight in the refrigerator, then reheat until steaming hot. Frozen plum pieces may release extra moisture as they thaw, so the texture can be softer than that of a freshly baked portion.

Serve warm or cold with plain yoghurt, Greek-style yoghurt, cottage cheese, fortified soya yoghurt or another protein source that fits the household’s needs. Fresh plum slices or a spoonful of seeds can add contrast, but sweetened toppings will increase the overall sweetness.

Nutrition and portion requirements differ according to age, activity, health needs and the rest of a person’s diet. Anyone managing allergies or a medical condition should choose ingredients and serving sizes appropriate to their own professional dietary advice.

Source: Editorial research