Preheat oven to 400 degrees
Add cold butter to 13×9″ baking pan and place the pan in the oven
In a bowl add flour and salt. Whisk together
In liquid measuring cup whisk together milk, eggs, and parmesan cheese
Combine dry and wet ingredients by pouring liquid mixture into dry mixture and whisking together until smooth, thin batter forms
Thin slice meat and veggies and fold into the batter
Slowly pour batter into hot pan with melted butter from oven
Bake 22-25 minutes until golden and edges are fluffy
Remove from oven and serve right away with favorite toppings or plain!