Evenly distribute the butter cubes into the bottom of an oblong baking dish. Sprinkle the brown sugar over the butter. Arrange the pear slices into the bottom of the dish. Arrange the bread cubes into a single layer over the pears.
Mix the eggs, milk, sugar, vanilla essence and almond essence together in a bowl until fully blended; pour evenly over the bread cubes, assuring all pieces are evenly covered. Cover the dish with aluminium foil and chill overnight in refrigerator.
Preheat an oven to 180 degrees C. Remove the baking dish from the refrigerator and allow to warm while the oven preheats.
Bake in the preheated oven until the top of the bread is golden brown and the eggs have solidified, 45 to 60 minutes. Top with the sliced almonds to serve.
If you are using a glass baking dish, don't put it right into the oven out of the fridge because it might crack. Allow it to warm while the oven preheats.