Home Made Vanilla - Vanilliné
Flour - Farine
Flour comes in many numbers T45 T55 and T65 are the most common you'll find in the grocery stores.
Brown Sugar - Cassonade
Brown Sugar - Vergeoise
Baking Soda - Bicarbonate
Cornflour - Maizena
This is a brand name and available in all French grocery stores.
Baking Powder - Levure Chimique