Key Lime Pie is a light, no-bake frozen dessert that’s perfect for hot summer days and backyard barbecues. This Weight Watchers–friendly version is low in calories and simple to make, especially if you use a store-bought reduced-fat graham cracker crust.
If you enjoy pie recipes, try Cherry Cream Cheese Pie, Joanna Gaines’ French Silk Pie, or Lemon Meringue Pie for Two.
Why You Will Love This Recipe
This recipe is incredibly quick and fuss-free. It comes together in under five minutes when you use a pre-made graham cracker crust, and the reduced-fat crust keeps the dessert lighter. The filling is creamy yet refreshing—a perfect dessert for warm weather.
Variations to try: The filling is very adaptable. Swap the lime gelatin and key lime yogurt for other Jell-O and yogurt flavor combinations—strawberry, lemon, or peach would all work. Use your favorite fat-free or low-fat yogurts to experiment with different tastes and textures.
Ingredients Needed
- Reduced-fat graham cracker crust — a ready-made crust keeps this recipe fast and light.
- Sugar-free lime gelatin — if you can’t find sugar-free, the regular variety will work.
- Boiling water — used to dissolve the gelatin.
- Fat-free whipped topping — convenient and low effort compared with making whipped cream from scratch.
- Fat-free key lime pie yogurt — you can substitute other flavored fat-free yogurts to change the flavor profile.
- See the recipe card below for exact measurements.
How to Make Key Lime Pie
Step 1: In a large bowl, dissolve the gelatin in boiling water. Let it cool for a few minutes so it isn’t piping hot when combined with the other ingredients. If you prefer another flavor, substitute your favorite gelatin and matching low‑fat yogurt.
Step 2: Whisk in the yogurt until smooth, then gently fold in the fat-free whipped topping to keep the filling light and airy.
Step 3: Spread the mixture into the graham cracker crust, smooth the top, and refrigerate for at least 2 hours until set.
When firm, slice into 8 wedges and serve chilled. Serving size: 1 slice.
What Can You Serve with Key Lime Pie?
Key lime pie pairs well with light accompaniments that balance its tartness. A dollop of extra whipped topping and a sprinkle of lime zest brighten the presentation and flavor. Fresh berries like strawberries or raspberries add sweetness and color. For a cool contrast, serve with a scoop of vanilla ice cream. To drink, choose iced tea, lemonade, or a light summer beverage.
Pro Tips (from experience)
- Let the dissolved gelatin cool for 10–15 minutes before mixing to avoid a watery filling.
- Fold the whipped topping in gently to keep the filling light and fluffy.
- If possible, chill the pie overnight—this improves the texture and flavor.
🍽️ Serving Suggestions
- Top with extra whipped topping and a touch of lime zest for garnish.
- Serve with fresh berries for added color and sweetness.
- Pair with iced coffee, iced tea, or a light summer drink.
Recipe FAQs
As a dessert, key lime pie is a treat rather than a health food. This lighter, no-bake version uses reduced-fat ingredients and sugar-free gelatin to lower calories, making it a better option if you’re watching intake.
Store leftovers in an airtight, food-grade container in the refrigerator. The pie should keep for several days when properly covered.
Key lime pie balances sweet and tangy flavors with a creamy texture. Even this simplified version delivers a refreshing tartness from the lime combined with a smooth, mousse-like filling.
Other Recipes to Try
-
Best Weight Watcher Desserts
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Weight Watcher Brownies
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Weight Watcher High Protein Recipes
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Chicken Egg Roll In a Bowl
If you make this Key Lime Pie or any recipe from this site, please leave a star rating and a comment to let me know how it turned out—I love hearing feedback! Follow along on TikTok @jennarecipediaries.
Weight Watchers Key Lime Pie
5 from 1 review
- Author: Jenna
- Prep Time: 20 min
- Total Time: 20 min
- Yield: 8
- Category: Easy
- Method: no bake
- Cuisine: American
Description
Weight Watchers’ Key Lime Pie is a refreshing, no-bake dessert that’s ideal for summer. It’s light, quick to prepare, and satisfying without being heavy.
Ingredients
- 1 reduced-fat graham cracker crust
- 1 (1 oz) package sugar-free lime gelatin
- ¼ cup boiling water
- 1 (8 ounce) container fat-free whipped topping
- 2 (6 ounce) containers fat-free key lime pie yogurt
Instructions
- In a large bowl, dissolve gelatin in boiling water. Let cool slightly.
- Stir in the yogurt with a wire whisk until smooth.
- Gently fold in the whipped topping using a spatula.
- Spread the mixture into the graham cracker crust and smooth the top.
- Refrigerate for at least 2 hours until set.
- Slice into 8 pieces and serve chilled.
Notes
Points Plus: 2
myWW points: Blue 7; Green 7; Purple 7 (as calculated in the WW recipe builder)
Nutrition
- Serving Size: 1/8 of the pie
- Calories: 148
- Sugar: 8g
- Fat: 4g
- Saturated Fat: 3g
- Carbohydrates: 23g
- Fiber: 1g
- Protein: 3g