Preheat your oven to 320°F (160°C). Generously grease a 12-cup standard muffin tin with butter, coconut oil, or cooking spray. Don't skip this, it's important for easy removal!
Combine Dry Ingredients: In a large bowl, combine dry ingredients, salt, and cinnamon.
Add Wet Ingredients: Add wet ingredients to the dry ingredients.
Add Egg Whites: Lightly beat the egg whites with a fork until slightly frothy. Pour them over the oat mixture.
Mix Well: Using your hands (wear gloves if you prefer!) or a sturdy spoon, mix everything together thoroughly until the mixture is well combined and sticky when pressed between your fingers.
Portion: Divide the mixture evenly among the 12 prepared muffin cups. An ice cream scoop works great for this – aim for about 50g per cup if you have a scale.
Form the Cups: Use the back of a small spoon (dipping it lightly in water can help prevent sticking if needed) to press the mixture firmly into the bottom and up the sides of each muffin cup, creating a well in the center. Make sure the base and walls are well-compacted.
(Image: Close up of pressing the mixture into the muffin tin with a spoon, like 1:39)
Bake: Bake for 15-20 minutes, or until the edges are golden brown and look crispy.
Cool Slightly: Let the granola cups cool in the muffin tin for about 10 minutes. This allows them to firm up slightly before you try to remove them.
Remove & Cool Completely: Carefully run a butter knife or small offset spatula around the edges of each cup to loosen them. Gently lift them out and transfer them to a wire rack to cool completely. They will crisp up further as they cool.
Fill (Just Before Serving): Once completely cool, fill the cups with your desired toppings right before you plan to eat them.