Preheat the oven to 350°F (175°C). Line or lightly grease a 12-cup muffin tin.
In a large bowl, whisk together the oat flour, quinoa flakes, baking powder, baking soda, and cinnamon, if using.
In a blender or food processor, blend the silken tofu until completely smooth. Add the date paste, nut or seed butter, and vanilla. Blend until creamy.
Pour the wet ingredients into the dry ingredients and stir just until combined. Avoid overmixing. If the batter seems too thick, stir in 2–4 tablespoons of plant milk until it reaches a thick, scoopable consistency.
Gently fold in your chosen add-ins (see variations below).
Divide the batter evenly among the muffin cups, filling each about three-quarters full.
Bake for 24–26 minutes, or until the tops are lightly golden and a toothpick inserted into the centre comes out clean.
Let the muffins cool in the pan for 10 minutes before transferring them to a wire rack to cool completely.