
These bars are the kind of bake that makes the whole kitchen smell like a cozy autumn afternoon — golden crumble on top, a glossy honey-pear filling in the middle, and a sturdy oat-and-rice-flour base that holds together beautifully when you slice it into nine squares. Managing histamine can make sweet treats feel off-limits, since so many baked goods lean on fermented, aged, or processed ingredients that quietly push histamine levels up. Here, the filling is built around fresh ripe pears and a touch of honey, cooked down with tapioca starch until it turns thick and jammy — no dried fruit, no citrus zest, no chocolate in sight. The crust and crumble use rolled oats, rice flour, and cold unsalted butter, keeping things simple and free from the usual problem ingredients that sneak into store-bought bars. A small pinch of nutmeg adds warmth without relying on spice blends that can be harder to vet. The parchment overhang trick makes lifting and slicing a breeze, and cooling them fully before cutting means you get clean, satisfying bars rather than a crumbly mess. Whether you're baking for yourself or sharing with others navigating similar restrictions, this is a recipe that genuinely delivers on both flavor and peace of mind.
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Low histamine diets often limit warming spices like nutmeg. The trace amount used here is likely tolerated. If you prefer to always avoid nutmeg, please tap it and change its rating to Red.

Preheat the oven to 350°F (175°C). Line a 9×9-inch baking pan with parchment paper, leaving a 2-inch overhang on two opposite sides to use as handles for lifting the bars out later.
In a large mixing bowl, whisk together the rolled oats, rice flour, tapioca starch (the crust-and-crumble portion), granulated sugar, and fine sea salt until evenly combined. Scatter the cold butter cubes over the dry mixture and work them in with a pastry cutter or your fingertips until the mixture resembles coarse, clumpy crumbs with some pea-sized pieces of butter remaining — do not work it until smooth.
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