Method
Preheat the oven to 190°C (375°F) with a rack in the centre. Line a 12-cup muffin tin with paper liners.
In a large bowl, whisk the flour, protein powder and baking powder.
In a second bowl, whisk the eggs, Greek yogurt, milk and oil.
Fold the wet ingredients into the dry until just combined, then fold in the diced ham, cheddar and sliced green onion.
Divide between the cups and bake for about 20 minutes, until golden and a toothpick comes out clean.
Cool in the tin for 5 minutes, then on a rack. Keep in the fridge for 4 days; warm for 20 seconds in the microwave.
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Storing and reheating
Keeps 4 days or 3 months frozen.