Pumpkin sheet cake is a useful party bake when you want one pan to do the work. This version combines pumpkin puree, oil and warm spices, then finishes with maple cream cheese frosting spread in broad spoon swirls. There are no cake layers to level or stack. The recipe is scaled for a 9-inch square pan, with guidance for choosing pumpkin puree and keeping the maple frosting spreadable without making it runny. This is an original recipe draft that has not yet been kitchen-tested; use the texture and doneness cues alongside the estimated timings.

A little preparation

Before you start

  • One 9-inch / 23-cm square metal cake pan, at least 2 inches / 5 cm deep
  • Parchment and a little oil for greasing
  • Kitchen scale, two bowls, whisk and spatula
  • Electric mixer for the frosting
  • Wire rack and an ordinary tablespoon for decorating
01

Choose pumpkin puree, not pumpkin pie filling

Use plain, unsweetened pumpkin puree. Pumpkin pie filling usually contains added sugar and spices, so it changes this formula. Canned puree is a convenient option because its texture is comparatively consistent.

Homemade puree can work differently depending on the pumpkin and how it was cooked. If liquid collects around it or it pours like soup, drain excess moisture and cool it before weighing. The recipe assumes a thick, spoonable puree, not pumpkin juice.

02

One square pan keeps the decorating manageable

The batter goes into one 9-inch square pan. A 9-by-13-inch pan makes a much thinner cake with a different baking time, so do not treat the pan sizes as interchangeable. Parchment handles let you lift the cooled cake onto a board if you want clean exposed sides.

You can also frost and serve the cake in its pan. Make sure the centre is fully cool either way. Warm pumpkin cake can feel deceptively soft, and heat underneath cream cheese frosting will make the topping slide.

03

Maple flavour without flooding the frosting

Use pure maple syrup and measure it. The frosting already contains moisture from cream cheese, so freely pouring in more syrup can make it loose. Beat the butter and icing sugar first, then briefly mix in the cream cheese, maple syrup and salt.

If the frosting does not hold a shallow spoon trail, refrigerate it for 15 to 20 minutes before deciding it needs more sugar. Use full-fat block cream cheese; spreadable tub products can behave differently. The maple flavour is a gentle complement to the pumpkin spice rather than a thick syrup layer.

04

Make the spoon swirls the decoration

Spread frosting across the cold cake and drag the back of a spoon into broad curves. Lift the spoon at the end of each sweep for small soft peaks. A very light dusting of cinnamon gives the ivory top definition without adding a second decoration project.

For a neat party platter, chill the frosted cake briefly and cut it into 12 rectangles. Wipe the knife between slices. Keep the top simple so the pumpkin crumb and frosting remain the focus.

05

Storage and common problems

Refrigerate the frosted cake in a covered container and use within 3 days. Let individual pieces stand briefly before serving. You can bake the sponge the day before, cool it fully and refrigerate it wrapped; add the frosting on the serving day.

A gummy centre can indicate underbaking or unusually watery puree. Test the central crumb with a skewer and continue baking if it carries wet batter. A dry edge with an underdone middle can point to an oven running hot or a pan size different from the one specified.

Keep this one

Pumpkin Maple Sheet Cake

Makes, at 1×
12 slices from one 9-inch square cake
Prep
30 min
Baking
35 min
Start to finish
About 2 hr 35 min

Allow about 90 minutes for the cake to cool completely before frosting. Total time is approximately 2 hours 35 minutes.

Original recipe draft · not yet kitchen-tested. Baking times are estimates; use the doneness checks in the method.

Batches

Ingredients

Pumpkin cake

Maple cream cheese frosting

To finish

Let’s make it

  1. Heat the oven to 175°C / 350°F conventional, or 155°C fan. Grease a 9-inch square metal pan and line the base and two sides with parchment handles.
  2. Whisk together the flour, baking powder, salt, 5 g cinnamon, ginger and nutmeg. Break up any lumps in the brown sugar in a separate bowl.
  3. Whisk the brown and white sugars with the eggs, oil, pumpkin puree and vanilla until evenly combined. Add the flour mixture and fold with a spatula until no dry streaks remain.
  4. Spread the batter evenly in the pan. Bake for approximately 30 to 40 minutes, checking from 30 minutes. The centre should spring back lightly and a skewer should show a few moist crumbs rather than raw batter.
  5. Leave in the pan for 15 minutes, then lift onto a rack if serving on a board. Allow roughly another 75 minutes, or until the cake is completely cool, before frosting.
  6. Beat the frosting butter until smooth. Gradually mix in the icing sugar and salt. Add the cool cream cheese and measured maple syrup, and mix briefly on low speed just until smooth. If loose, chill for 15 to 20 minutes and stir gently.
  7. Spread over the cold cake. Use the back of a tablespoon to make broad, shallow swirls. Dust lightly with the finishing cinnamon; avoid a thick powder layer.
  8. Cut into 12 slices. For cleaner edges, chill the frosted cake briefly before cutting and wipe the knife between cuts. Refrigerate leftovers covered.

Original draft, not yet kitchen-tested. The AI image shows a serving concept. Use plain pumpkin puree and full-fat block cream cheese. Baking time changes with puree moisture and pan material; follow the central doneness check. Contains wheat, eggs and milk. Keep the frosted cake refrigerated and use within 3 days.

From the notebook

The little details

  • Check that the can says pure pumpkin or pumpkin puree, with no added pie filling ingredients.
  • Measure the maple syrup for the frosting; extra liquid changes its consistency.
  • Cool the centre of the cake completely before adding cream cheese frosting.

Your questions, answered

Can I use pumpkin pie filling instead of puree?

Not as a direct substitute. This recipe assumes plain unsweetened pumpkin puree and adds its own sugar and spices.

What pan size is this pumpkin sheet cake for?

Use one 9-inch square metal pan. A 9-by-13-inch pan spreads the batter much thinner and changes the baking time.

Can I decorate it without a piping bag?

Yes. Spread the maple cream cheese frosting with a spoon and drag the spoon through it to make broad swirls.

Why is my maple cream cheese frosting runny?

The ingredients may be too warm, the cream cheese too watery or the syrup over-measured. Chill the frosting briefly and use full-fat block cream cheese and the measured syrup amount.

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