Mix all of the ingredients (except for olive oil and the topping ingredients) in a large bowl. Whip thoroughly.
Pour the batter to 6 muffin cups and leave in the oven to bake for about 10 to 15 minutes.
As the muffins are baking, make the topping. Simply whip together the mustard and ketchup in a bowl.
Remove the muffins from the oven and spread some of the sauce toppings on each one. You can also add some extra cheese on top (optional). Replace in the oven and leave to bake for 8 to 10 more minutes.
Remove from the oven and let sit to cool for around 5 to 10 minutes. Garnish with fresh parsley.
Extra step: Did you know that you can also add bacon to this dish? Simply place a slice of bacon around each hole of the muffin pan before adding the meat mixture in. This makes it easier to remove the muffin later, and besides this, who doesn’t love bacon?