Position a rack in the middle of the oven; preheat to 350 degrees. Prep a muffin pan (line with paper liners or spray with baking spray or grease with butter). Or prep a loaf 8-by-4 1/2-by-2 3/4-inch loaf pan.
In a large bowl, whisk together the flour, baking powder, salt and pepper.
In a medium bowl, whisk together the eggs. Add in the milk, mustard, and oil.
Add the egg mixture to the flour mixture. Use a wooden spoon to combine the wet with dry ingredients, scraping the sides and bottom of the bowl.
Gently fold in the cheeses, chives, and herbs to form a thick dough.
Pour into the prepared muffin tray and bake until golden brown, 20 to 25 minutes, or until a toothpick comes out clean.
Let the muffins cool a few minutes before removing. Enjoy while they're warm!