Preheat oven to 375. Use regular or silicone muffin pan, 12 muffin size. If using silicone pan, spray with nonstick spray. If using regular muffin pan, put two paper liners into each slot, then spray liner with nonstick spray. In the bottom of the muffin cups layer diced meat, cheese and green onions. You want the muffin cups to be 3/4 full, with just enough room to pour a little egg around the other ingredients. Beat eggs well with the half and half (you could use milk). Pour egg into each muffin cup until it is full to the brim, nearly overflowing. Bake 25-30 minutes until muffins have risen above the rim of the muffin cups and are slightly browned and set.