Preheat the oven to 400°F/200°C/Gas 6. Line a rimmed baking sheet with a piece of parchment paper for easy clean-up and set it aside.

Slice the zucchini and onion into 1/8" slices and place them into a large bowl with olive oil. Add sea salt and freshly ground black pepper to taste and toss to combine.

Arrange the zucchini and onion in a single layer on the prepared baking sheet and place in the oven to roast for 18-20 minutes until tender and lightly golden.

Transfer the cooked zucchini mixture to a blender or a food processor. Add Greek yogurt, cream cheese, fresh herbs, and lemon juice. Process until smooth and creamy. Taste and adjust the seasoning with additional salt, pepper, and/or lemon juice.

For the best flavor, place the zucchini dip in the refrigerator to chill and allow the flavors to marinate for at least 90 minutes prior to serving. Serve with crackers and/or crudites as desired. Enjoy!