Clean the mushrooms and chop them finely. Melt the butter in a skillet over medium heat. Sauté the mushrooms until golden brown. Let them cool slightly.
In a large bowl, whisk together the flour, baking powder, salt, and pepper.
In another bowl, whisk the eggs, add the milk, and stir in the cooled sautéed mushrooms.
Pour the wet ingredients into the dry ingredients and mix until just combined. Be careful not to overmix.
Preheat your waffle iron and grease it lightly with butter or oil to prevent sticking.
Pour the batter onto the hot waffle iron, sprinkle with grated cheese, and cook for 3-4 minutes, or until golden brown and crisp.
Remove the cooked waffle and place it on a wire rack to cool slightly and maintain its crispness.
Serve fresh, topped with sour cream or fresh herbs, if desired.
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