Jumbo Blueberry Muffins, Gluten Free

Instructions

1. 1

   Prep the pan

   Line a 6-cavity jumbo muffin pan with jumbo paper liners, or grease it very generously, including the flat surface between the cavities. Liners are the safer choice here — gluten-free muffins are more fragile while warm and stick more readily to bare metal. Don't preheat the oven yet; this batter needs a longer rest first.

2. 2

   Whisk the dry ingredients

   In a large bowl, whisk the gluten-free flour blend, xanthan gum (only if your blend doesn't already list it), sugar, baking powder, baking soda, and salt for a full 30 seconds. Gluten-free blends are made of several starches that settle at different rates in the bag, so thorough whisking matters more than it does with wheat flour.

3. 3

   Combine the wet ingredients

   In a medium bowl, whisk the melted butter and oil with the eggs until smooth, then whisk in the sour cream, milk, vanilla, and lemon zest. Everything should be at room temperature so the melted butter stays emulsified rather than seizing into specks.

4. 4

   Bring the batter together

   Toss the blueberries with the tablespoon of gluten-free flour. Pour the wet mixture into the dry and stir until smooth, then fold in the berries. Unlike wheat batter, you can't overmix this one — there's no gluten to toughen — so stir until no dry pockets remain. The batter will look looser than you expect at this stage.

5. 5

   Rest the batter (don't skip this)

   Cover the bowl and rest the batter at room temperature for 30 minutes. This is the single most important step in the gluten-free version: the rice flour and starches need time to drink up the liquid, which eliminates any gritty texture and thickens the batter enough to dome. It should go from pourable to thick and scoopable, holding a soft peak on the spatula. In the last 10 minutes, preheat the oven to 425°F (218°C) with a rack in the lower third.

6. 6

   Fill and top

   Divide the batter among the six cavities, filling each to the rim and mounding the center slightly. Smooth the tops lightly with a wet fingertip if they look ragged — gluten-free batter doesn't self-level the way wheat batter does. Sprinkle generously with coarse sugar.

7. 7

   Bake hot, then low

   Bake at 425°F for 5 minutes, then reduce to 350°F (177°C) without opening the door and bake another 30 to 34 minutes. Gluten-free muffins need a few extra minutes and want to be baked slightly further than wheat ones — pull them too early and the centers sink as they cool. Look for tops that are well browned and spring back firmly when pressed, with a skewer that comes out clean apart from a stray crumb.

8. 8

   Cool completely before unmolding

   Leave the muffins in the pan for 15 minutes, then transfer to a rack. Gluten-free crumb sets as it cools and is genuinely delicate while hot, so give them a full 30 minutes before cutting into one. The texture improves noticeably once they reach room temperature.

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Baker's Tips

• 1.

  If you only have a standard 12-cup pan, this batter makes about 14 regular muffins. Keep the 5 minutes at 425°F, then drop to 350°F for 15 to 18 minutes.

• 2.

  Frozen blueberries work well, but add them straight from the freezer without thawing. Thawed berries bleed purple streaks through the batter and release enough water to make the crumb gummy.

• 3.

  A full tablespoon of baking powder looks like a lot, but jumbo muffins need the extra lift to raise that much batter before the crumb sets. Check that yours is fresh — a spoonful should fizz vigorously in hot water.

• 4.

  An oven thermometer earns its keep here. Many ovens signal 'preheated' well before they actually hit 425°F, and a weak start means flat tops.

• 5.

  For a bakery-style bonus, swap the coarse sugar for a quick streusel: rub 1/4 cup flour, 3 tablespoons brown sugar, and 2 tablespoons cold butter together until crumbly and press it onto the tops before baking.

• 6.

  Bake one pan at a time on a lower rack. Crowding two pans into the oven drops the temperature and kills the dome.