In a medium bowl, combine flour, garlic powder, onion powder, paprika, salt, and black pepper. Mix well.
In another bowl, beat the eggs until well combined.
Place the breadcrumbs in a third bowl.
Dip each mushroom in the flour mixture, shaking off excess. Then dip in the beaten eggs, and finally coat with breadcrumbs. Set aside on a plate.
In a large skillet, heat about 1 inch of vegetable oil over medium-high heat until hot (about 350°F).
Carefully add the breaded mushrooms in batches to the hot oil, frying until golden brown and crispy, about 3-4 minutes per side. Remove with a slotted spoon and drain on paper towels.
For the Cool Ranch Dip, combine sour cream, mayonnaise, dill, garlic powder, onion powder, parsley, salt, black pepper, and lemon juice in a bowl. Mix until smooth and well combined.
Serve the crispy fried mushrooms warm with the Cool Ranch Dip on the side.