Whisk together the eggs, heavy cream, cinnamon, and nutmeg. Set aside while you prepare bread.

Slather Nutella on the insides of bread slices and sprinkle blueberries to form a single layer on the bread. Press slices together to form a "sandwich".

Heat a small skillet with butter. Dip Nutella & Blueberry bread into french toast batter, coating both sides. Drop into hot skillet and cook until brown. Flip and cook on other side. Keep warm in the oven if making a larger batch.

Serve with powdered sugar and bacon.