
A nostalgic vanilla sponge tray bake with glossy icing and rainbow sprinkles — a simple, comforting school-dinner favourite that's quick to make and easy to share.

My family’s reaction the first time I brought this to a school registration meeting was priceless: adults reached for seconds and the kids lined up as if I’d brought cookies. Making this taught me that small finishes — a neat icing pour and a careful sprinkle — make a simple sponge feel celebratory.
My favourite part is how a single tray transforms an ordinary afternoon into an event — from school pickups to neighbours dropping by, this sponge bridges generations. When I bring a tin to gatherings, someone always shares their own school-dinner memory, and that shared nostalgia is as comforting as the cake itself.
Store at room temperature in a single layer inside an airtight container to protect the icing finish — refrigerating will make the sponge firm and dry. If you must refrigerate in a warm climate, wrap tightly and give it time to return to room temperature before serving. For longer storage, slice into portions, wrap each piece tightly in cling-film and place in a freezer-safe container; they’ll keep well for up to 3 months. When reheating, allow frozen slices to thaw at room temperature and serve as-is or warm briefly in a low oven for five minutes to refresh the texture.
You can use unsalted butter instead of margarine for a richer flavour — reduce added salt in other recipes accordingly. If you don’t have self-raising flour, combine 2 cups plus 2 tablespoons of plain flour with 3 teaspoons of baking powder. For a dairy-free version, ensure the margarine is labelled dairy-free and the sprinkles contain no milk derivatives. Swap vanilla for almond extract for a different flavour profile, but use sparingly as almond is stronger.
Serve slices with a hot pot of tea or a tall glass of milk for classic comfort. For a more grown-up tea service, dust the edges with finely grated lemon zest before slicing or serve with a side of slightly tart raspberry jam to cut the sweetness. For parties, arrange the slices on a platter with fresh berries and mint for colour contrast and freshness.
The tray bake is a cornerstone of British home baking and school-dinner culture — humble, economical and designed to feed many. This format evolved from wartime and post-war home baking when simple ingredients needed to make large quantities without fuss. The sugary icing and sprinkles are a later, celebratory addition, popular with school caterers and home bakers who wanted to give children a treat in an affordable way.
In spring and summer, fold grated lemon or orange zest into the batter and swap the white icing for a thin lemon glaze. In autumn, stir a pinch of cinnamon into the batter and use caramel-coloured sprinkles. For winter holidays, use red and green decorative sugars and add 1/4 teaspoon of mixed spice to the mix — these small swaps keep the base method intact while nodding to the season.
This tray bake is ideal for meal prep: bake on a Sunday, slice into portions and store for snacks during the week. For lunchboxes, wrap slices individually to keep them fresh. If you want to layer in fillings later, spread a thin layer of jam or buttercream between slices before freezing so you can thaw a ready-to-eat treat.
There’s something quietly wonderful about a simple sheet of sponge iced and sprinkled — it proves that joy doesn’t always come from complexity, but from technique, memory, and sharing. I hope this version becomes a reliable favourite in your kitchen and brings as many smiles and small celebrations as it has in mine.
Ensure margarine is at room temperature (soft but not melted) to achieve a light, aerated crumb when creamed with sugar.
Sift the powdered sugar before making icing to avoid lumps and add water slowly until the icing reaches a pourable heavy-cream consistency.
Line the baking pan with parchment paper overhanging the sides for an easy lift and neat edges when slicing.
Allow the cake to cool completely before icing to prevent the icing from melting and running off.
Cut the cake with a sharp knife warmed slightly under hot water and wiped dry for cleaner slices.
This nourishing old school sprinkle sponge tray bake recipe is sure to be a staple in your kitchen. Enjoy every moist, high protein slice — it is perfect for breakfast or as a wholesome snack any time.
Test the cake with a skewer: insert into the centre and remove. If the skewer comes out clean or with a few dry crumbs, the cake is done.
Yes. Cool completely, slice if desired, wrap tightly in cling-film and freeze up to 3 months. Thaw at room temperature before serving.
This Old School Sprinkle Sponge Tray Bake recipe makes perfectly juicy, tender, and flavorful steak every time! Serve with potatoes and a side salad for an unforgettable dinner in under 30 minutes.

Preheat oven to 350°F (180°C) and line a 9x13-inch pan with parchment paper, leaving an overhang for easy removal.
Beat room-temperature margarine and caster sugar until pale and fluffy, about 3–5 minutes with an electric mixer on medium speed.
Add eggs one at a time, mixing each fully before adding the next. If the mixture looks curdled, add a tablespoon of flour or a splash of milk.
Sift and fold in self-raising flour in two or three additions. Stir in vanilla and the optional tablespoon of milk; the batter should be smooth and ribbon-like.
Pour batter into the prepared pan, level the top and bake 25–30 minutes. Test with a skewer—it should come out clean or with a few dry crumbs.
Sift icing sugar and whisk in warm water until pourable. Once the cake is completely cool, pour icing over and immediately scatter sprinkles. Allow to set before slicing.
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