Spinach & Cheese Savoury Muffins

medium eggs

 / 1/2 cup milk

/ 1/2 cup butter, melted

 / 2 cups grated cheddar cheese

spring onion, chopped

/ 2 cups fresh baby spinach, chopped

red pepper, diced

/ 2 cups self raising flour

vegetable stock cube (can use low or no sodium stock cube)

salt and pepper to taste (but can be left out)