In a large skillet add some olive oil and lightly fry the onion until soft. Add the garlic and chopped veggies and cook for 15 mins. Then add the minced beef and lountza and continue cooking for about 15 mins, until all liquids have evaporated. Add the chicken stock, cream, Worchester sauce, paprika and bay leaf, stir well and bring to a boil. Add the pasta and cook until liquids have been absorbed and the pasta is cooked al dente. Remove the bay leaf and add the halloumi and cheddar cheese. Mix well until cheeses have completely melted and sauce is thickened.