Whisk together pumpkin puree, soy milk, pumpkin spice, flour, vanilla extract, and sugar until smooth and incorporated.
Lightly coat bread with the pumpkin mixture. Scrape off excess mixture: too much mixture on the bread will make mushy French toast. =(
Melt some vegan margarine on the pan (use about 1/4 tsp per slice on the pan) and cook French toast on each side until golden brown. Repeat until all bread (or mixture) is used up. Serve with maple syrup and/or a dusting of icing sugar!