Mix eggs, 1 ½ cups (375 mL) of the milk, 3 tsp (15 mL) of the cinnamon, 3 tsp (15 mL) of the vanilla, and baking powder in a large bowl with wire whisk until well blended. Add cubed bread; toss well to coat. Pour into 13x9-inch (33x23 cm) baking dish, sprayed with no stick cooking spray. Cover. Refrigerate at least 4 hours or overnight.