Beef mince: place a large frying pan onto the stove top, turn the heat to high and pour in the olive oil. Next add the garlic and saute for about 20 seconds. Then add the beef mince, salt, pepper and diced onion. Cook till browned using a wooden spoon to break up any clumps of meat as you go.
Additions: once the mince has cook through pour in the Worcestershire sauce then crush the 2 stock cubes over the top of the saute pan. Next add the frozen vegetables, stir to combine and let these thaw and cook (around 2 minutes). Once the vegetables have softened add the tomato puree followed by the tomato paste, then sprinkle in the Italian herbs. Gently stir to combine and turn the temperature down to low. Let the mince simmer for 5-10 minutes stirring every now and then. Next turn the heat off, remove the pan from the stove and let the mince cool on a heatproof surface.
Preheat the oven: preheat the oven to 180°C / 350-375°F / Gas Mark 4-5. (No need to do right at the start as it will be heating during the time you are cooking the mince).
Muffin tins: use cooking spray to liberally grease 2 x 12 cup muffin tins. Then set aside.
Pie bases: thaw the shortcrust pastry and then working one sheet at a time cut the pie bases using the cookie cutter. Repeat till you have enough pastry circles to fill each muffin hole. Working one circle at a time place the cut pastry on top of each muffin hole then push down gently to line the base and sides of the tin with the pastry rounds. Repeat for both tins.
Pie filling: use an ice-cream scoop to fill each of the pie bases with the cooled savoury mince.
Pie tops: working one sheet at a time use a 6.5cm (2.5 inch) cookie cutter to cut the puff pastry into circles for the pie tops. Place these cut rounds on top of the pie filling then gentle push them down and round your fingers around the outside to seal.
Egg wash: crack the egg into small bowl discarding the egg white. Add a splash of water to the egg yolk and use a mini fork to whisk. Next use a basting brush to brush the top of each pie with the egg wash. Repeat till all pies are done.
Pierce: next take a sharp knife and push down into the puff pastry top for each pie to make a very small incision. Repeat for each pie.
Oven bake: place the 2 muffin tins into the oven and bake the pies for 20 - 25 minutes. Rotate the 2 trays at the halfway point. When they are cooked use oven mitts to remove the muffin tins and place them onto a heatproof surface. Let the pies sit in the muffin tin to cool. Once they have cooled slightly use a small teaspoon to push the edges and remove each pie from the muffin tin.
To serve: serve the pies hot with your preference of tomato or bbq sauce. Add cooked peas to the plate for a dinner serving suggestions.