Preheat the oven to 375°F. Generously spray a muffin pan with cooking spray.
In a food processor, combine 2/3 cup chickpeas, 2 tablespoons peanut butter, 2 tablespoons of the agave, 1 teaspoon vanilla extract, 1/2 teaspoon cinnamon, and a pinch of salt. Process until smooth and creamy, stopping to scrape down the sides as needed.
Finely chop 2 tablespoons of the semi-sweet chocolate chips and fold them into the chickpea mixture. Transfer the filling to a small bowl.
Place a 2-teaspoon-sized ball of the chickpea–chocolate filling into the center of each muffin cavity.
In a large, microwave-safe bowl, melt the remaining 1/2 cup semi-sweet chocolate chips at 50% power in 30-second intervals, stirring between intervals, until smooth.
Gradually whisk 2 cups liquid egg whites into the melted chocolate. The mixture may look lumpy at first; continue whisking and scraping the bowl until it becomes smooth and uniform.
Whisk in 1/2 cup vanilla Greek yogurt and the remaining 5 tablespoons of agave until well combined.
Whisk in 1/4 cup coconut flour until fully incorporated and the batter is smooth.
Divide the chocolate-egg batter among the muffin cavities, filling almost to the top and covering the chickpea filling.
Bake at 375°F until the tops feel set, about 19–20 minutes. Remove from the oven and allow the muffins to cool completely in the pan (they will deflate as they cool).
If desired, drizzle with additional peanut butter before serving.
Notes
Muffins will deflate as they cool.
Optional: drizzle additional peanut butter before serving.