This paragraph is used to check browser font size. If the font size is 25px or greater, the browser will apply a large font size class to the body.

Easy Zucchini Foil Packets

By: Schwartz UK

March 11, 2026

If you've ever wondered how to grill zucchini and squash, look no further! Our recipe for grilled vegetables in foil is one of the easiest summer side dishes around. With grated Parmesan cheese, melted butter, basil leaves, garlic powder, and onions, this zucchini on the grill recipe is perfect for your chicken, seafood, and meat dishes.

Ingredients

1/4 cup French's® Classic Yellow Mustard
1/4 cup butter melted
2 tablespoons grated Parmesan cheese
1/2 teaspoon McCormick® Basil Leaves
1/2 teaspoon McCormick® Garlic Powder
1 large zucchini, cut into 1/4-inch thick slices
1 medium yellow squash, cut into 1/4-inch thick slices
1 small yellow onion, thinly sliced
4 sheets (12x12-inch each) heavy duty aluminum foil

Nutrition Information

(per serving)

Key products

Dried Basil

£1.85

Schwartz Garlic Powder

£2.15

Instructions

Mix mustard, butter, Parmesan, basil, and garlic powder in a large bowl until well blended. Add zucchini, squash, and onions; toss to coat well.
Divide vegetable mixture evenly among sheets of aluminum foil. Bring up sides of foil; double fold top and ends to tightly seal each packet.
Grill packets over medium-high heat for 10 to 12 minutes or until zucchini is tender. Sprinkle with additional Parmesan cheese before serving, if desired.