Warm half of the milk, then dissolve the yeast in it. Mix and let it sit for 5 minutes until fully dissolved.
Chop the dill, tarragon, and parsley. Melt the butter in a saucepan over high heat until it turns golden and has a nutty aroma (brown butter). Let it cool.
Warm the remaining milk in a saucepan and whisk in the potato flakes. Off the heat, add the milk with yeast. Stir in the eggs, Parmesan cheese, red pepper flakes, herbs, salt, and the brown butter. Mix well.
Transfer the batter to a bowl, cover with a clean cloth, and place it in a warm spot away from drafts. Let it rest for 30 minutes.
Preheat a waffle iron and lightly grease it. Place 1 tablespoon of batter in the center of each waffle iron plate. Close the waffle iron and cook for 2 to 3 minutes, monitoring the color. Enjoy the waffles while still warm.