This Impossible Buttermilk Pie is an easy old-fashioned dessert with a creamy custard filling, tangy buttermilk flavor, and a magical self-forming crust.
Combine eggs, buttermilk, both sugars, baking mix, melted butter, vanilla, lemon zest/juice, and salt in a large bowl. Beat with a mixer until smooth, 20–30 seconds.
Pour into the pie plate. Bake 40 to 45 minutes, until the top is golden and the center has just a slight jiggle (a knife near the center should come out mostly clean).
Cool on a rack 1 hour, then chill at least 1–2 hours for the cleanest slices. Sprinkle powdered sugar on top. Serve cool or at room temperature. Top with whipped cream and/or berries, if desired.
Notes
For a tarter pie, use 1 ¼ cups sugar total; for sweeter, keep the full 1 ½ cups as written.
Orange zest is lovely if you’re out of lemons.
If the top browns early, tent loosely with foil for the last 10 minutes.
1 ¾ cups milk + 1 tbsp lemon juice; let stand 5 minutes (real buttermilk gives better body and tang).
Cover and chill up to 4 days.
Wrap slices well; freeze up to 2 months. Thaw overnight in the fridge.