Preheat oven at 450 degrees. Coat a 12 cup bundt pan with nonstick spray.
Toss bread cubes with 1 stick of melted butter, granulated sugar and cinnamon; spread on a baking sheet and bake until crisp (about 20 minutes).
Whisk together half and half, milk, and eggs in a large bowl; add toasted bread cubes and toss until bread is coated.
Combine remaining stick of melted butter and brown sugar in a bowl; pour half into the bottom of the prepared bundt pan. Top with half the pacans and half od the soaked bread. Spread the remaining sugar mixture and pecans over the bread cubes in the pan; top with remaining bread cubes and any milk-egg mixture left in the bowl. Press bread into mixture, cover with plastic wrap and chill overnight.
Preheat the over and 350 degrees. Remove plastic wrap and place pan on a baking sheet; bake until top is crisp and instant-read thermometer registers at least 165 degrees (about 40 minutes). Remove bread and let stand 5 minutes. Loosen edges and turn onto serving platter.
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