Step 1

Preheat oven to 350°. Toast almonds on a rimmed baking sheet, tossing halfway through, until golden brown, about 5 minutes. Let cool, then coarsely crush. Set aside.

Step 2

Meanwhile, place chocolate in a small glass or ceramic bowl and microwave in 20-second bursts, stirring well between each, until melted and smooth, 1–1½ minutes. Let cool slightly.

Step 3

Spray a 9x5" loaf pan with nonstick spray. Line with parchment paper or plastic wrap, leaving plenty of overhang on 2 sides (the spray will help it stick to the pan and cooperate more).

Step 4

Purée avocado, maple syrup, and almond butter in a food processor until very smooth, about 1 minute. Add cocoa powder, kosher salt, and 2 Tbsp. cold water. Pulse until smooth, then add melted chocolate. Pulse just until combined, scraping down sides of bowl as needed.

Step 5

Transfer chocolate mixture to prepared pan and smooth top. Scatter reserved almonds over, then season with sea salt; press in lightly. Chill until firm, about 1 hour. Remove by lifting up parchment, then cut into squares or bars to serve.

Step 6

Do Ahead: Fudge can be made 1 week ahead. Keep chilled.