Preheat the oven to 425 degrees. Generously spray a 11X17 inch baking pan with non-stick spray.
In a large bowl, whisk together the dry ingredients: flour, white sugar, 1 Tablespoon brown sugar, baking powder, and salt.
Measure the milk into a measuring cup. Add 1 Tablespoon of vinegar to the milk and allow it to sit for a few minutes, until it begins to bubble.
In a separate medium bowl, whisk the eggs until frothy. Mix in the vanilla, and milk with the vinegar added. Then mix in the melted butter.
Add the wet ingredients (egg/milk mixture) into the dry ingredients (flour mixture). Stir until just combined.
Pour your batter into the prepared sheet pan/baking sheet.
Now add in your toppings. You can mix them all together or create sections like I did. Just lightly lay the toppings in each quadrant of the batter and fit them together like a puzzle.
Bake for 12 minutes then check for doneness. The pancake will slightly brown on top as it bakes, just make sure to cook until done.