Sourdough Pumpkin Bars with Maple Cream Cheese Frosting

These sourdough pumpkin bars are light and dense at the same time. Properly moist, spiced throughout, with a tight, tender crumb that holds together when you pick one up rather than sagging under its own frosting.

Jump to:

• Recipe Highlights
• Ingredient Notes
• Method STEPS To WATCH
• TOP Tips
• Variations
• Serving Suggestions
• Storage and Make-Ahead
• More Pumpkin Sourdough Recipes
• Sourdough Pumpkin Bars with Maple Cream Cheese Frosting

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I tested this one through most of September here in North Wales, weighing batter into a 9x9 inch pan until the height, the bake time and the frosting ratio all stopped fighting each other.

The batter uses proper amounts of both pumpkin puree and sourdough discard rather than tipping discard onto a normal pumpkin bar recipe and hoping for the best, which is where most gumminess problems start. Maple runs through both the batter and the frosting, not just a token drizzle at the end.

Cooking for something denser and sweeter? Try our chai-spiced Sourdough Pumpkin Blondies.

Ingredient Notes

Find the full ingredient quantities and method in the recipe card below, but a few things are worth explaining first.

• 100% pumpkin puree, not pumpkin pie filling. Pie filling comes pre-sweetened and pre-spiced, which throws off both the sugar balance and the moisture content this recipe is built around. If your tinned puree looks visibly watery when you open it, blot it with kitchen paper before measuring. This batter doesn't need the extra water, and it's one of the more common reasons sourdough discard pumpkin bars turn gummy in the middle.
• Sourdough discard, 100% hydration. This assumes an equal-weight flour and water starter. If yours is fed differently, the batter's moisture balance will shift slightly, so treat the bake time as a guide and check with a skewer regardless. The discard isn't doing any leavening here, baking powder and bicarbonate of soda handle the lift, so active or inactive discard both work.
• Neutral oil, not melted or browned butter. Oil keeps the crumb moist for the full 4-5 days these bars keep in the fridge. Butter firms up and tightens the crumb once chilled, which matters more here than in a bake you'll eat the same day, since these need refrigeration once frosted.
• Real maple syrup, in both the batter and the frosting. Maple carries more water and less concentrated sweetness than honey or sugar syrup, which is exactly why the frosting ratio below is different from a standard cream cheese frosting. It's built on the frosting I use on my sourdough cupcakes, rebalanced because maple behaves differently under the whisk.
• Full-fat cream cheese for the frosting.

Method STEPS To WATCH

Full quantities and step-by-step method are in the recipe card. Here's what to actually watch for at each stage.

1. Whisk the wet ingredients until properly smooth. Pumpkin puree, discard, egg, oil, maple syrup, brown sugar and vanilla should come together into one uniform mixture with no streaks of discard still visible. This matters more than it sounds like it should, since unmixed discard pockets bake up gummy rather than blending into the crumb.

2. Whisk the dry ingredients separately, flour, baking powder, bicarbonate of soda and spices, so the raising agents are evenly distributed before they meet any liquid.

3. Fold, don't beat, the dry into the wet. Stop the moment there's no visible flour left. The batter should look thick and heavy, closer to a quick bread than a cake batter. Overmixing here develops gluten you don't want in a bar meant to be dense and tender rather than chewy.

4. Spread it right into the corners. This batter is thick enough that it won't level itself the way a thinner cake batter would, so push it into the corners of the pan with a spatula rather than assuming it'll settle on its own.

5. Bake at 180°C / 350°F for 26-30 minutes. You're looking for a skewer that comes out with a few moist crumbs clinging to it, not wet batter, and edges that have just started pulling away from the sides of the tin. Pull it too early and the centre stays raw under a set top. Leave it too long and you lose moisture you can't get back.

6. Cool completely before frosting. It depends on the temperature of your kitchen, but it will take at least a couple of hours. I like to place the pan on a wire rack to ensure the base is cooling too.

7. Cream the butter, icing sugar and maple syrup first, two to three minutes until genuinely light and fluffy. This is the step that gives the frosting its structure before the cream cheese goes anywhere near it.

8. Add the cream cheese in two additions, a third first, beaten smooth, then the rest, mixed just until combined. Overbeating once the cream cheese is in is the main cause of a frosting that goes soft and won't hold its shape, since it starts breaking down the structure you just built.

TOP Tips

🎃 Blot visibly wet pumpkin puree before measuring it. Some tins are noticeably wetter than others, and the batter is balanced on the assumption of a reasonably thick puree. Extra water in is the single biggest cause of a gummy centre.

🔪 Trust the skewer test over the clock. Ovens vary enough that the 26-30 minute window is a starting point, not a guarantee. A few moist crumbs on the skewer is correct. Wet batter clinging to it means it needs more time.

🧊 Chill the bars before you frost them, not just cool them. Room-temperature bars are soft enough that a knife or the frosting itself can tear the crumb. Twenty minutes in the fridge after the initial cool firms them up just enough for clean squares.

🥄 If the frosting turns soft, chill it rather than adding more icing sugar. Maple carries more moisture than honey or a sugar syrup, so a warm kitchen can leave the frosting looser than expected. Fifteen to twenty minutes in the fridge brings it back to spreadable without diluting the flavour balance.

🔥 Don't skip blotting if you're using homemade puree. Homemade pumpkin puree tends to run wetter than tinned, not less. If it looks glossy or pools any liquid when you scoop it, blot it the same way you would a watery tin.

Variations

• Brown butter frosting. Swap the butter for browned and cooled butter for a nuttier frosting that still takes the maple well.
• Chai-spiced batter. Add a pinch of ground cardamom and black pepper alongside the existing spices for a warmer, slightly sharper spice profile.
• Toasted pecan or pumpkin seed (pepita) topping. Press toasted pecans or pepitas into the frosting before it sets for texture and a less uniform, more bakery-style finish.

Serving Suggestions

Best served chilled or just short of room temperature, the frosting holds its shape better cold, and the spice comes through clearly either way. Good for a lunchbox square, a low-effort addition to an autumn gathering spread, or with coffee once the frosting's had a few minutes to soften slightly.

Storage and Make-Ahead

Store covered in the fridge for up to 4-5 days. The frosting means these need to stay chilled rather than sitting out, though they're fine at room temperature for 10-15 minutes before serving if you prefer them slightly softer.

To make ahead, bake and cool the bars unfrosted, then wrap tightly and freeze for up to 2 months. Thaw overnight in the fridge and frost once fully defrosted. Frosted bars don't freeze as cleanly, the texture of the cream cheese frosting suffers on thawing, so freeze plain and frost fresh instead.

More Pumpkin Sourdough Recipes

If pumpkin and sourdough discard is a combination you keep coming back to this time of year, there's more where this came from. My Sourdough Pumpkin Scones With Maple Glaze uses the same maple pairing in a flakier, breakfast-shaped format, and my Sweet Sourdough Pumpkin Focaccia takes the flavour somewhere completely different. Sourdough Pumpkin Cinnamon Rolls With Cream Cheese Frosting are worth a look too. Below, you will find more autumnal sourdough recipes: