Today, April 28th, 2021, marks National Blueberry Pie Day. Fun fact: The first documented recipe for blueberry pie appeared in 1872 in the Appledore Cook Book. What better way to celebrate the day and start your pie-making season than with this classic Allrecipe's Blueberry Pie? This Blueberry Pie recipe calls for four cups of fresh blueberries, which are one of the healthiest fruits on the market. You can find this scrumptious recipe on the website of Allrecipe.