Add 1-1/2 cups cottage cheese, 1/4 cup vanilla protein powder, 1/2 cup almond milk, 1/4 cup maple syrup, 1 teaspoon vanilla extract, 2 tablespoons tahini, 1/4 cup pistachios, 1/4 cup spinach, and 1/2 avocado to a high-speed blender or food processor. Blend until completely smooth and creamy. Taste the mixture and adjust sweetness if needed by adding more maple syrup.
In a microwave-safe bowl, combine 3 tablespoons chocolate chips and 2 teaspoons coconut oil. Microwave in 30-second intervals, stirring between each, until completely melted and smooth. Set aside to cool slightly while preparing the container.
Spread the pistachio ice cream mixture into a shallow, freezer-safe container. A wider, flatter container will help it freeze more quickly and evenly. Drizzle the melted chocolate over the top of the ice cream base. Using a small spoon, gently swirl the chocolate through the mixture, being careful not to overmix.
Cover the container and freeze for 2-4 hours, or until firm enough to scoop. If frozen solid, allow to thaw on the counter for 10-15 minutes before scooping. Serve with extra chopped pistachios on top if desired.