Preheat the oven to 350°F (175°C). Lightly spray a muffin tin with cooking spray or line it with paper or silicone muffin liners. Set aside.
Blend the batter: Add all ingredients, except for the chocolate chips, into a high-speed blender. Blend on high for about one minute until smooth and creamy.
Add chocolate chips: Gently stir in the chocolate chips with a spatula until evenly mixed.
Fill the muffin tin: Pour the batter into each muffin cup, filling them about ¾ full. Sprinkle a few extra chocolate chips on top if you like.
Bake: Place the tin in the oven and bake for 18–20 minutes, or until the tops are firm and a toothpick inserted into the center comes out clean.
Cool and enjoy: Let the muffins cool in the pan for 5–10 minutes, then transfer them to a wire rack to cool completely.