In a shallow dish or pie plate, whisk together the plant-based milk, flour, sugar, cinnamon, nutmeg, and vanilla extract until smooth and well combined. Ensure there are no lumps of flour.

Heat 15 ml of cooking oil in a large non-stick skillet or griddle over medium heat until shimmering.

Quickly dip one slice of bread into the batter, ensuring both sides are coated, but avoid letting it soak for too long. Immediately place the battered bread onto the hot skillet.

Cook for 3-4 minutes per side, until golden brown and cooked through. Add more oil to the skillet as needed for subsequent slices.

Remove the cooked French toast from the skillet and place on a wire rack or a plate. Repeat with the remaining bread slices, adding more batter and oil as needed.