To make pancakes: Preheat oven to 425 F. In food processor, process brie until finely broken up. Add milk, biscuit mix, sugar, lemon juice and lemon zest. Process until smooth, about 10 seconds. Add eggs and process until just beaten in.
In 10-inch oven-proof skillet, melt butter. Pour in batter. Bake 15-20 minutes until browned and set.
To make sauteed pears: In saute pan, melt butter. Add pears, sugar, orange juice, nutmeg and cinnamon; saute over high heat until pears are tender and juice has caramelized. Serve with pancakes and toasted walnuts.