In a large bowl, combine spice mix and salt. Whisk in 1/2 cup (125 mL) sugar, eggs, milk and vanilla; set aside.
Butter an 11 x 8-inch glass baking dish. Slice bananas and arrange evenly in the bottom of the baking dish. Butter bread slices on both sides and cut into cubes; sprinkle over top of bananas to cover. Pour egg mixture evenly over top and sprinkle with remaining 1/4 cup (50 mL) of sugar.
Bake in preheated 350°F (180°C) oven for about 1 hour or until knife inserted in centre comes out clean and top is golden brown and slightly puffed. Let cool slightly before serving.
3/4 tsp (4ml) ground cinnamon
1/2 tsp (2 ml) freshly grated nutmeg
1/4 tsp (2 ml) ground cloves
Tip: For an extra touch of sweetness and elegance, serve with a dollop of whipped cream.