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No-Bake Blackberry Mousse Tart – Creamy Vegan Dessert

This No-Bake Blackberry Mousse Tart is a stunning dessert that combines a crunchy base with a smooth, creamy filling and a vibrant blackberry topping. It’s elegant enough for special occasions yet simple enough to make without turning on the oven. What makes this tart truly special is its balance of textures and flavors—sweet, slightly tangy, rich, and refreshing all at once. Perfect for warm days, celebrations, or when you want a dessert that feels light but indulgent, this vegan no-bake tart is made with plant-based ingredients and natural flavors. The deep purple color of blackberries adds a beautiful visual touch, making it a show-stopping dessert for guests while remaining easy to prepare.
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Prep Time 30 minutes
chill time 4 hours
Total Time 4 hours 30 minutes
Servings: 8 servings
Ingredients Equipment Method Notes

Ingredients
  

Crust
  • 1½ cups rolled oats
  • 1 cup almonds
  • 2 tablespoons cocoa powder
  • 2 tablespoons maple syrup
  • 3 tablespoons coconut oil melted
Blackberry Mousse Filling
  • 1½ cups blackberries fresh or frozen
  • 1 cup coconut cream
  • ½ cup plant-based yogurt
  • ⅓ cup maple syrup
  • 2 tablespoons lemon juice
  • 1 teaspoon vanilla extract
  • 2 teaspoons agar powder
Topping
  • 1 cup blackberries
  • 1 tablespoon maple syrup
  • 1 teaspoon lemon juice

✨ Kitchen Essentials You’ll Love

Quick picks I trust for better results, faster prep, and easier cleanup.

  • 🍳

    Lodge Seasoned Cast Iron Skillet

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  • ⚡

    Instant Pot Duo Plus 9-in-1 Electric

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  • 🔥

    CHEFMAN Digital Air Fryer XL 10L

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Disclosure: As an Amazon Associate, I earn from qualifying purchases at no extra cost to you.

Equipment

  • Springform tart pan or pie pan
  • Food processor or blender
  • Mixing bowls
  • Spatula
  • Measuring cups and spoons
  • Small saucepan
  • Whisk
  • Refrigerator

Method
 

Step 1: Add rolled oats and almonds to a food processor and blend until a coarse flour forms.
    Step 2: Add cocoa powder, maple syrup, and melted coconut oil to the processor. Blend again until the mixture becomes sticky and holds together when pressed.
      Step 3: Press the crust mixture firmly into the bottom of a tart pan, creating an even layer. Place it in the refrigerator to chill.
        Step 4: In a small saucepan, combine blackberries, maple syrup, and lemon juice. Cook over low heat until the berries soften and release their juices.
          Step 5: Blend the cooked blackberry mixture until smooth, then strain if desired for a smoother texture.
            Step 6: In the same saucepan, whisk the blackberry puree with coconut cream, plant-based yogurt, vanilla extract, and agar powder.
              Step 7: Heat the mixture gently while stirring continuously until it thickens slightly and the agar is fully activated.
                Step 8: Remove from heat and allow the mixture to cool for a few minutes.
                  Step 9: Pour the blackberry mousse over the chilled crust and smooth the top evenly.
                    Step 10: Refrigerate the tart for at least 4 hours, or until fully set.
                      Step 11: For the topping, gently mix blackberries with maple syrup and lemon juice.
                        Step 12: Spoon the blackberry topping over the set tart just before serving.

                          Notes

                          🧊 Storage & Reheating
                          Store the tart covered in the refrigerator for up to 3 days.
                          Serve chilled for best texture and flavor.
                          This dessert does not require reheating.
                          For clean slices, use a sharp knife wiped between cuts.
                          🥄 Variations
                          Replace blackberries with raspberries or blueberries.
                          Add a thin layer of melted dark chocolate over the crust before adding the mousse.
                          Use cashew cream instead of coconut cream for a different texture.
                          Add lemon zest to the mousse for extra brightness.
                          ❓ 10 FAQs
                          Is this tart completely vegan?
                          Yes, all ingredients are plant-based.
                          Does this dessert need baking at all?
                          No, it is completely no-bake.
                          Can I use frozen blackberries?
                          Yes, thaw them slightly before cooking.
                          What helps the mousse set?
                          Agar powder gives the filling structure.
                          Can I make this tart ahead of time?
                          Yes, it’s perfect for preparing a day in advance.
                          Is the tart very sweet?
                          It has a balanced sweetness with a light tang.
                          Can I make it gluten-free?
                          Yes, use certified gluten-free oats.
                          How long does it need to chill?
                          At least 4 hours for best results.
                          Can I freeze this tart?
                          Freezing is possible, but texture may change slightly.
                          How do I get clean slices?
                          Chill well and use a sharp, warm knife.
                          🏁 Conclusion
                          This No-Bake Blackberry Mousse Tart is proof that elegant desserts don’t need complicated steps or baking time. With its crunchy base, creamy filling, and fresh berry topping, it delivers both beauty and flavor in every slice. Whether you’re hosting guests or treating yourself, this vegan tart is a refreshing, satisfying dessert that always impresses.