Blueberry muffins over time
225 of the 272 recipes carry a publication date, from 1998 to 2026. Below: how many pages each year, whether the typical batch changed between the oldest and newest, and the oldest and newest pages themselves.
A date here is the one the page gives for itself: when it was published, or last updated. Sites often refresh an old recipe and its date together, so read these as when the pages went up, not when the recipes were created.
Recipes per year
Dated pages by the year they give. The first bar gathers the 6 pages from before 2007. Shading marks the periods compared below.
How the typical batch changed
No ingredient shows a clear change between blueberry muffin pages dated before 2019 and those dated 2023 or later. The medians move a little from period to period, but by no more than chance would with this many recipes.
| Per 100 g flour | Before 201974 recipes | 2019 to 202266 recipes | 2023 and later85 recipes |
|---|---|---|---|
| BlueberriesNo clear change | 78% | 86% | 80% |
| SugarNo clear change | 65% | 68% | 71% |
| FatNo clear change | 38% | 43% | 43% |
| EggNo clear change | 33% | 38% | 39% |
| DairyNo clear change | 72% | 66% | 62% |
| LeaveningNo clear change | 4.4% | 4% | 4.2% |
| SaltNo clear change | 0.8% | 0.8% | 0.8% |
Each cell is the median baker's percentage in that period: grams of the ingredient per 100 g of flour. Higher and lower compare the newest period with the oldest, only where the change is clear (see how below). Periods are cut at year boundaries so each holds about the same number of recipes.
Oldest and newest pages
Oldest dates
Sep 4, 1998
Lemon-Blueberry Muffins · bettycrocker.comJul 18, 2000
Whole Wheat-Blueberry Muffins · bettycrocker.comNov 25, 2003
Oatmeal-Whole Wheat Blueberry Muffins · bettycrocker.comJan 1, 2004
Heidelbeer-Muffins · bettybossi.chJan 1, 2004
Muffins aux myrtilles · bettybossi.ch
Newest dates
Sep 23, 2026
Simply Perfect Blueberry Muffins · bakingamoment.comAug 7, 2026
Zucchini Blueberry Muffins · tasteofhome.comJul 29, 2026
Blueberry Muffins Recipe · aspicyperspective.comJul 21, 2026
Muffins myrtilles & citron : la meilleure recette · marmiton.orgJun 28, 2026
Blueberry Muffins With Streusel Crumb Topping · ruchiskitchen.com
How the dates are read
Each date is the publication date in the recipe page's own structured data. 31 of the 272 recipes have none, or one without a year (such as “December 3”), and are left out.
16 more carry a date their site gave to many pages at once, which marks a site move or redesign rather than a publication: 2018-01-01 on tasteofhome.com (222 pages across Recipe Lab, 4 of them here), 2006-10-23 on marmiton.org (74 pages across Recipe Lab, 3 of them here) and 2004-01-01 on bettycrocker.com (21 pages across Recipe Lab, 2 of them here), and 7 more like it. They are left out too.
A change counts as clear when the newest period's median differs from the oldest period's by at least a tenth and a rank test puts the gap at 2.5 standard errors or more. For the share of recipes using an ingredient, the bar is 3 standard errors and 8 percentage points. Every ingredient is tested, so a lower bar would flag chance differences on most pages.
2026 is still in progress, so its bar is short for a reason that has nothing to do with baking.