Preheat oven to 350°F (175°C) and grease a 12-cup muffin tin or use silicone liners.
In a large bowl, whisk together oats, baking powder, salt, cinnamon, ginger, cardamom, cloves, and black pepper.
In a separate bowl, whisk together eggs, milk, maple syrup, melted coconut oil, and vanilla extract.
Combine the wet and dry ingredients, stirring until the oats are fully hydrated.
Divide the mixture evenly among the 12 muffin cups, pressing down slightly to ensure the liquid is distributed.
Bake for 20 to 25 minutes until the centers are firm to the touch and edges are lightly browned.
Cool in the pan for 10 minutes before transferring to a wire rack to set completely.