Before getting started, you'll want to preheat your waffle iron. Also be sure to get a can of nonstick cooking spray out and ready to go.
Start by whisking together the flour, cornstarch, sugar, baking powder, baking soda and salt in a large mixing bowl. Create a well in the middle.
In a medium bowl, whisk together the milk, vegetable oil, eggs and vanilla extract 'til well combined.
Once everything is mixed together, pour the milk mixture into the well that you created in the top of the dry mixture. Use a spatula to gently fold everything together until just incorporated. Don't be tempted to over-mix the batter; it's okay if everything is a little bit lumpy.
Last but not least, use the same spatula to fold in the thawed strawberries, just until evenly distributed.
Spray your preheated waffle iron with cooking spray, and add about a 1/2 cup of waffle batter to the iron. Close the lid and bake until cooked through.
Remove waffles and serve right away. If you're making a large batch, you can transfer them to a large baking sheet and into the oven at 200ºF to keep warm until you're ready to serve.