Combine flour, salt, pepper, sugar, and leavening agents into a medium sized bowl. Hand whisk together.
Pour in buttermilk and melted butter. Stir with a wooden spoon until a batter is formed.
Add cheese, spinach, and tomatoes. Stir until evenly distributed.
The batter will be thicker than regular waffle/pancake batter but if looks very dry, just add some more buttermilk a Tbsp at a time. (Do not add a lot of buttermilk to make it runny. )
Spoon batter into each waffle section ( or 3/4 of entire circle for large single round waffle)
Batter will be thick so spread across with spoon to cover enough surface area for waffle.
Close lid and let bake for 8-9 min.