Preheat oven to 425°F.
Cut four large pieces of aluminum foil.
Divide the summer squash and zucchini slices between the 4 pieces of foil, placing them in the center.
1 yellow squash, 1 zucchini
Top each pile of vegetables with a cod fillet.
4 cod fillets
Season with salt, pepper and Italian seasoning.
salt, pepper, 1 teaspoon Italian seasoning
Add the garlic evenly between the 4 fillets.
2 cloves garlic
Top each fillet with a lemon slice and pieces of butter.
1/2 lemon, 2 tablespoons butter
Add the tomatoes around the fillet.
1 cup cherry tomatoes
Fold the foil over the top of the fish and roll the sides up tightly. Keeping the open side up, place the foil packets on a baking sheet.
Bake for approximately 15-20 minutes or until the internal temperature of the fish reaches 145℉ on a meat thermometer inserted into the center of the thickest portion.
Carefully unwrap the foil packets and transfer the fish, vegetables and accumulated juices to a plate, if desired.