Avocado Chocolate Mousse Bars

Steps

1. 1

   Prepare Pan and Make Crust

   • Line an 8×8-inch (20×20 cm) square baking pan with parchment paper, leaving a 2-inch overhang on two opposite sides for easy removal (optional but helpful).
   • In a medium bowl, combine the graham cracker crumbs, melted unsalted butter, granulated sugar, and salt.
   • Stir with a fork until the texture resembles wet sand—the butter should evenly coat all the crumbs.
   • Press this mixture firmly into the bottom of the prepared pan, using the bottom of a measuring cup to compact it into an even, tight layer about ¼ inch thick.
   • Refrigerate while you prepare the mousse.

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   Ready when: Crust is firmly compacted and cold to the touch; it holds together when pressed

   Tip: Line with parchment paper for easy removal; you can simply lift the entire block out of the pan to cut into bars.

2. 2

   Melt Dark Chocolate

   • Fill a saucepan about halfway with water and bring it to a gentle simmer over medium heat.
   • Place the chopped dark chocolate in a heatproof bowl and set it over the simmering water (double boiler method), making sure the bottom of the bowl does not touch the water.
   • Stir occasionally with a spatula or whisk until the chocolate is completely melted and smooth, about 3–4 minutes.
   • Remove the bowl from heat and let the chocolate cool to room temperature for about 5 minutes, stirring occasionally to release steam and speed cooling.

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   Ready when: Chocolate is completely smooth and fluid; the outside of the bowl feels cool to the touch

   Tip: Do not allow the bottom of the bowl to touch simmering water, or the chocolate may seize or scorch. If you see graininess, whisk in a tiny spoonful of coconut oil.

3. 3

   Prepare Avocado Base

   • Cut the avocados in half lengthwise, remove the pit by striking it gently with the knife and twisting it out, and scoop the flesh into a medium mixing bowl.
   • Mash the avocado with a fork until mostly smooth, leaving just a few small chunks about the size of a small pea—do not overmash or use a food processor, as this will make the texture gummy and unpleasant.
   • Add the fresh lime juice immediately—this both flavors the mousse and prevents the avocado from browning due to oxidation.
   • Stir in the lime zest and vanilla extract until well combined.

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   Ready when: Avocado is smooth with small chunks throughout; lime juice is fully incorporated

   Tip: Add the lime juice immediately after mashing to prevent browning. If you must wait, press plastic wrap directly onto the avocado surface to keep out air.

4. 4

   Combine Mousse Ingredients

   • Add the cooled melted chocolate to the avocado mixture.
   • Using a rubber spatula, fold the chocolate into the avocado gently, turning the mixture over itself repeatedly until the chocolate is evenly distributed and no white streaks remain, about 1–2 minutes.
   • Add the sweetened condensed milk and fold again until just combined—avoid overmixing.
   • In a separate bowl, whip the cold heavy cream to soft peaks: it should hold a loose, billowy shape and be spreadable but not stiff.
   • Fold the whipped cream into the avocado-chocolate mixture in two additions: add half, fold gently until almost combined, then add the remaining half and fold until just combined.
   • Stop folding as soon as no white streaks are visible; overfolding will deflate the cream and make the mousse dense instead of airy.

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   Ready when: Mousse is pale tan with no white streaks visible; it looks light and airy throughout

   Tip: Fold gently and stop as soon as the mixture is combined; overfolding deflates the whipped cream and makes the mousse dense.

5. 5

   Assemble and Chill

   • Remove the crust from the refrigerator.
   • Spread the mousse evenly over the crust using a spatula, smoothing the top gently.
   • Work quickly but carefully to avoid deflating the mousse.
   • Cover the pan loosely with plastic wrap or aluminum foil to prevent the surface from drying out or forming a skin.
   • Refrigerate for at least 2 hours until the mousse is completely set and firm to the touch.
   • You can prepare this step up to 6 hours ahead; any longer and the crust may absorb too much moisture from the filling.

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   Ready when: Mousse no longer jiggles when you tap the pan; it feels firm when you gently press the surface

   Tip: The longer you chill (up to 6 hours), the firmer the bars will be and less likely to break apart when cut.

6. 6

   Dust, Cut, and Serve

   • Remove the pan from the refrigerator.
   • Using a fine-mesh sieve or cocoa powder shaker, dust the top of the mousse evenly with unsweetened cocoa powder, creating a generous, even coat.
   • If you lined the pan with parchment paper, lift the entire bar block out by grasping the overhang and place on a cutting board.
   • Using a sharp knife, cut the bars into a 3-by-4 grid (12 equal pieces), wiping the knife clean with a damp cloth between each cut to prevent smudging and ensure clean edges.
   • If desired, garnish each bar with a tiny pinch of additional lime zest.
   • Serve immediately straight from the refrigerator.

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   Ready when: Bars are cut into 12 equal squares with clean, sharp edges

   Tip: Use a sharp knife and wipe between cuts for clean, professional-looking edges. These bars are best served very cold straight from the refrigerator.