Heat oven to 200C/180C fan/gas 6. Line 2 muffin trays with paper muffin cases. In a large bowl beat the eggs lightly with a handheld electric mixer for 1 min. Add the oil and milk and beat until just combined then add the sugar and whisk until you have a smooth batter. Sift in the flour and salt (and baking powder if using) then mix until just smooth. Be careful not to over-mix the batter as this will make the muffins tough. Stir in the chocolate chips or dried fruit if using.
Fill muffin cases two-thirds full and bake for 20-25 mins