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overhead view of key lime pie with oat graham crust on white plate
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5 from 4 votes

Key Lime Pie

This homemade Key Lime Pie is such a perfect dessert for the spring and summer. With a gluten-free oat graham crust filled with a tart and sweet filling, this pie will surely please everyone.
Prep Time20 minutes
Cook Time17 minutes
Total Time37 minutes
Course: Dessert
Cuisine: American
Keyword: key lime pie
Servings: 12 servings
Author: Lisa Kerhin

Ingredients

For the crust

  • cups Nairn's Oat Graham crumbs (about 1 1/2 boxes of Nairn's oat grahams)
  • cup sugar
  • 7 tablespoons unsalted butter, melted

For the filling

  • 2 cans (14 ounces each) unsweetened condensed milk
  • ½ cup light or reduced fat sour cream
  • ¾ cup fresh key lime juice (about 15 key limes)
  • zest from about 4 key limes
  • whipped topping and limes slices, optional for garnish

Instructions

  • Preheat oven to 375 degrees.
    Make the Crust – Crush the oat grahams, mix with melted butter and sugar, then press into the pan. Bake at 375°F for 7 minutes.
  • Juice and Zest the Limes – You’ll need about ¾ cup of juice and zest from 4–5 limes.
  • Mix the Filling – In a bowl, whisk together the condensed milk, sour cream, juice, and zest until smooth.
  • Preheat oven to 350 degrees
    Bake the Pie – Pour the filling into the cooled crust. Bake at 350°F for 10 minutes until just set.
  • Chill and Garnish – Let cool to room temp, then chill at least 3 hours. Add whipped cream and lime slices before serving.

Notes