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1
Preheat oven to 400F.
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2
2.
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To prepare packets, start with four 20- to 24-inch-long pieces of parchment paper or foil.
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Fold in half crosswise.
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5
With the parchment or foil folded, draw half a heart shape on one side as you would if you were making a Valentine.
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Use scissors to cut out the heart shape.
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Open up the heart.
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3.
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Place a chicken breast on one side of each open heart fairly close to the crease and leaving at least a 1-inch boarder around the edges for folding and spread with mustard.
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4.
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Toss zucchini, peppers, shallots, tomatoes, oil, thyme, salt and pepper in a large bowl.
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Place about 1 1/4 cups of the vegetable mixture on top of each piece of chicken.
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5.
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Close the packet to cover the ingredients.
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Starting at the top, seal the packet by folding the edges together in a series of small, tight folds.
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16
Twist the tip of the packet and tuck it underneath to help keep the packet closed.
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Place the packets on a large rimmed baking sheet (packets may overlap slightly).
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Bake until the vegetables are tender and an instant-read thermometer inserted into the thickest part of the chicken registers 165F, about 25 minutes.
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19
(Carefully open one package to check for donenessbe cautious of the steam.)
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20
Let the packets rest unopened for 5 minutes before serving.
