Fisherman's Pie - Olga's Flavor Factory

Ingredients

• 1 1/2 - 1 3/4 lbs russet potatoes (about 4 medium potatoes)
• 2 garlic cloves (minced)
• 1 onion (thinly sliced)
• 3 tomatoes (sliced)
• 4 Tbsp olive oil (plus more to brush the baking dish)
• 1 - 1/2 lbs white fish fillets (cod, haddock, swai, tilapia, snapper, sea bass, catfish, etc)
• fresh herbs (such as parsley, basil, dill)
• dry herbs (such as basil, thyme,)
• Old Bay (optional)
• salt (pepper)
• 4 Tbsp butter
• 1/3 - 1/2 cup milk
• 3 egg yolks