Heat griddle to medium-high. In a large bowl, whisk together eggs, milk, sugar, vanilla and cinnamon. When the griddle is hot, add a tablespoon each of butter and oil and spread around until melted.

Dip slices of Challah into the egg mixture, allowing it to soak in for a few seconds before flipping over to soak into the opposite side. Place onto the hot griddle and allow to cook until nicely browned, about 2-3 minutes per side.

While Challah is cooking, in a medium bowl, whisk together filling ingredients (or use an electric mixer) until well blended. Once the slices of Challah are done cooking, spread a nice thick layer of the pumpkin pie spiced mascarpone on half of them, and top them each with one of the remaining slices to make sandwiches.

Serve with a drizzle of maple syrup and a nice sprinkling of powdered sugar. Enjoy!