In a medium-sized bowl, whisk together the heavy cream, eggs, maple extract, vanilla extract, cinnamon, and nutmeg until well combined.
Dip one slice of brioche into the bowl, flipping it over to make sure both sides are coated. Use tongs to lift the bread out of the bowl and let the excess egg mixture drip back into the bowl.
Spray the waffle iron with cooking spray if your waffle iron requires it. Place the coated slice of brioche onto the waffle iron and close the lid. Cook until golden brown, 3-4 minutes. Repeat until all the slices of bread are cooked.