Bacon Cheese Puffs

INGREDIENTS :
1⁄2 cup milk
1 egg, lightly beaten
2 cups grated cheese, a sharp cheddar is best
2 medium onions, finely chopped
3 slices bacon, FINELY chopped (uncooked)
1 cup self-raising flour + 3 Tabeblespoons (this keeps them puffy)
1 teaspoon grainy mustard (or French mustard)

INSTRUCTIONS :
-Preheat oven to 180°C/350°F.
-Combine egg and milk, and stir into remaining ingredients.
-Drop by rounded teaspoon onto a lightly greased cookie sheet.
-Bake until golden (about 20 minutes).
-Cool on wire racks.