Heat the oil and fry the onion, vegetables, herbs and bay leaf in a large pan over moderate heat for 3 minutes, stirring occasionally.
Stir in the tinned tomatoes and stock and gently heat for 15 minutes.
In a separate pan, melt the butter over low heat, add the Loprofin Baking Mix. Stir over low heat for a few minutes.
Using a whisk, stir the Milupa-lp-Drink or Sno-Pro gradually into the flour mixture.
Bring to the boil while stirring, until sauce has thickened. Season with salt and pepper and set aside.
Spoon one quarter of the vegetable sauce over the base of an ovenproof dish and cover with a layer of lasagne sheets. Cover the lasagne with a layer of white sauce.
Repeat the layers until you have run out of sauce, finishing with a layer of lasagne sheets covered in white sauce.
For a crispy topping, add some Loprofin bread crumbs on top of the lasagne.
Place the lasagne in the oven for 30-40 minutes, until lasagne sheets are soft and top is golden brown.