Preheat your oven to 400°F and grease a standard muffin tin with olive oil.
In a large bowl, combine the flour, baking powder, salt, and sugar.
In a separate bowl, mix the warm water and olive oil.
Pour the wet ingredients into the dry ingredients and stir until just combined.
Fold in the chopped rosemary, minced garlic, black pepper, and red pepper flakes if using. Do not overmix; the batter should be slightly lumpy.
Spoon the batter evenly into the prepared muffin tin, filling each cup about 2/3 full.
Drizzle a little olive oil on top of each muffin and sprinkle with coarse sea salt.
Bake for 15-18 minutes or until the tops are golden brown and a toothpick inserted into the center comes out clean.
Allow the muffins to cool in the tin for 5 minutes before transferring them to a wire rack to cool completely.