1 Preheat the oven and prepare your baking sheets and casserole dish: Preheat your oven to 400°F and line two sheet pans with foil, and lightly grease your 9×13 baking dish.
2 Prep the bread: Tear or cut the bread into bite-size pieces and arrange in a mostly single layer on the sheet pans. Lightly coat the pieces of bread with olive oil, then season evenly with garlic powder, dried ground sage, and black pepper. The oil will help it stick.
3 Toast the bread: Place the baking sheets in the oven, and toast until the bread is golden brown, with some dry edges, about 5 minutes. There is no need to rotate the pans or toss the bread cubes.
4 Whisk your custard: While the bread is toasting, in a large bowl whisk together the eggs, milk, pumpkin puree, turmeric (if using), and salt.
5 Remove the bread and let it cool: Once the bread is toasted, remove it from the oven, and let it cool for…