Preheat oven to 350 degrees. Butter a 2-quart baking dish. In a large bowl, whisk together pumpkin puree, milk, cream, eggs, brown sugar, salt, vanilla, and cinnamon. Arrange bread in dish. Pour custard over bread and top with pecans (optional). Bake until custard is set, 45-55 minutes. Let cool slightly. Serve warm or at room temperature, drizzle with cajeta. Serve warm with freshly whipped cream. ENJOY!