Preheat your oven to 350°F and line a standard 12-cup muffin pan with paper liners. This ensures even heat distribution and prevents sticking while your batter comes together.

In a blender, combine the oats, sugar, sifted cocoa, baking powder, baking soda, espresso powder, and salt. Pulse the oats several times until they're broken down into a finer flour-like consistency—this creates better structure and crumb in your muffins. Don't over-blend; you want some texture remaining, not a fine powder.

Add the cottage cheese, milk, eggs, vanilla, and oil directly to the blender with the dry mixture. Blend on high speed for about 1-2 minutes until the batter is completely smooth and uniform—the cottage cheese will break down and incorporate fully, creating a rich, protein-packed batter. I like to scrape down the sides halfway through blending to ensure everything combines evenly.

Transfer the smooth batter to a bowl and gently fold in the chocolate chips by hand using a spatula. Avoid over-mixing at this point, as you want the chips distributed throughout without deflating the batter. This brief rest also allows the oats to absorb some moisture, which improves texture.

Divide the batter evenly among the 12 muffin cups, filling each about three-quarters full. Bake at 350°F for 17-22 minutes, until a toothpick inserted into the center of a muffin comes out with just a few moist crumbs (not completely clean, as the cottage cheese keeps them naturally moist). Start checking at 17 minutes to avoid overbaking.

Let the muffins cool in the pan for 10 minutes—this allows them to set enough to remove easily without falling apart. Transfer them to a wire rack to cool completely. I find that these muffins actually taste even better the next day as the chocolate flavor deepens and the texture becomes more tender.