Preheat the oven to 350 degrees f. Line a muffin tin with silicone (or paper sprayed with coconut oil) liners or use a silicone muffin tray.
Place all muffin ingredients in a blender and blend until smooth.
Pour the mixture into the prepared muffin tin.
Bake for about 20-22 minutes, or just until a toothpick inserted into the center of a muffin comes out clean.
Allow them to cool completely, then place one or two chocolate muffins into the lunchbox container, together with the remaining ingredients.
Refrigerate for up to 3 days.