Preheat oven to 350℉. Line a 12x17 inch rimmed baking sheet with parchment paper overlapping the sides.
In a large bowl, whisk together the eggs, olive oil and milk. Next, add in the flour, Italian herb blend, salt and mix together until combined. Batter will be runny. Pour the mixture on to the baking sheet. Top with mushrooms, pepperoni, tomatoes, mozzarella and olives. Bake for 20-25 minutes or until golden brown on top. Allow to cool slightly and then slice like a granny pie. We also enjoyed rolling up our individual slices like roll ups!