Heat the olive oil in a large saucepan on medium heat.
Add the shallots to the pan and the brown sugar and fry until the shallots soften and begin to caramelize.
Add the garlic and cook for another minute. Lower the heat and add the mushrooms to the pan, then cook for 5 minutes.
Finally, add the kale with 1 tbsp water, cover, and cook for two more mins or until it begins to wilt. Season to taste.
Make a roux by melting the butter in a large saucepan on medium heat.
Tip in the flour and mustard powder, mix and cook for 2 mins.
Remove from the heat and gradually whisk in the milk. Return to medium heat and bring to a boil; lower the heat and cook for 5 mins, stirring occasionally.
Season with nutmeg and salt and pepper.
Spread a thin layer of the white sauce over the base of a 1.5ltr ovenproof dish and top with one sheet of lasagne.
Spoon a third of the vegetable mixture on top of the lasagne, spoon over white sauce, just enough to cover.
Cover with two lasagne sheets. Repeat to create three layers in total.
Finish with the white sauce, crumbled goat's cheese, and Parmesan.
Sprinkle over the thyme and cook for 35 mins or until the lasagne is golden brown and bubbling.