Classic Scottish Shortbread Fingers, Gluten Free

Instructions

1. 1

   Line the pan and heat the oven

   Heat the oven to 325°F with a rack in the center. Line a 9-inch square pan with parchment, letting two sides hang over the edge so you can lift the slab out later. A low oven is deliberate here — shortbread should dry out and turn pale gold rather than brown, and a hotter oven will color the edges long before the middle is set.

2. 2

   Blend the butter and sugar

   Beat the softened butter and powdered sugar together on medium-low speed for about 1 minute, just until smooth and no lumps of sugar remain. Resist the urge to cream it pale and fluffy — air is the enemy of a dense, sandy shortbread, and an over-whipped dough will puff and then sink in the pan.

3. 3

   Add the vanilla and salt

   Beat in the vanilla and salt until evenly distributed, scraping down the bowl and the paddle once. The salt does a lot of work in a recipe this plain, so make sure it's fully dispersed rather than sitting in a pocket.

4. 4

   Work in the dry ingredients

   Whisk the gluten-free blend, xanthan gum, and cornstarch together thoroughly — the gum has to be evenly spread through the flour or you'll get gummy patches. Add it all at once and mix on the lowest speed until the dough looks like damp, clumpy sand, 30 to 60 seconds. It will feel slightly softer and stickier than a wheat dough, which is normal. There's no gluten to overwork, so mix until it genuinely holds together when squeezed.

5. 5

   Press it into the pan

   Tip the crumbly dough into the lined pan and press it into an even layer with your fingertips, pushing it well into the corners. Smooth the top with the flat bottom of a measuring cup or an offset spatula. An even thickness matters more than a pretty surface — thin spots will overbake while thick spots stay doughy.

6. 6

   Dock, then rest and chill

   Prick the dough all over with a fork, going down to the bottom of the pan in rows about an inch apart. Let the pan sit at room temperature for 25 minutes so the rice flour and starches in the blend fully hydrate — skip this and the baked shortbread will taste gritty. Then refrigerate for 30 minutes to firm the butter before baking.

7. 7

   Bake low and slow

   Bake for 42 to 50 minutes. Gluten-free shortbread needs a little longer and takes on color more slowly, so look for a matte, dry surface and edges that have turned light golden rather than relying on the clock. The center should be set but still pale. If the top starts browning before the time is up, drop the oven to 315°F.

8. 8

   Score hot, cool completely

   Set the pan on a rack and cut the hot slab into 24 fingers right away with a thin sharp knife, pressing straight down. Sprinkle with turbinado sugar if using. Cool the fingers fully in the pan, at least 90 minutes — gluten-free shortbread is noticeably fragile while warm and needs the extra time to firm up before you lift it out. The texture improves again after a night in the tin.

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Baker's Tips

• 1.

  Weigh the flour if you can. A heavy-handed cup of flour is the single most common reason shortbread turns out dry and chalky instead of melting.

• 2.

  Butter at cool room temperature — around 65°F, pliable but still slightly firm to the touch — gives the best texture. Greasy, over-soft butter makes a dough that spreads and bakes up dense.

• 3.

  Shortbread is better on day two. Overnight rest lets the flavor round out and the crumb settle into its proper sandy snap.

• 4.

  For a crunchier, more rustic bite, swap the cornstarch for an equal volume of fine rice flour. Cornstarch gives the softer, melt-in-your-mouth version.

• 5.

  Flavor variations go in with the vanilla: finely grated lemon or orange zest, a tablespoon of chopped rosemary, or a half teaspoon of almond extract all work without changing the ratios.

• 6.

  If the baked slab seems soft when it comes out, trust the cooling. Shortbread sets as the butter resolidifies, so judge doneness by color and dryness rather than firmness.