Preheat oven to 200°C and line a baking sheet with parchment paper.
Cut zucchinis into thick rounds and remove centers using an apple corer to form rings. Reserve the centers.
Toss the zucchini rings with olive oil, salt, garlic powder, onion powder, Italian herb blend, and grated parmesan cheese until evenly coated.
Arrange coated rings evenly on the baking sheet and optionally sprinkle extra Italian herb blend.
Bake the rings for 20 to 25 minutes until golden and crisp.
Heat 1 teaspoon olive oil in a skillet over medium-high heat and sauté reserved zucchini centers for 3 to 5 minutes until tender.
Transfer cooked zucchini centers to a mini food processor. Add lemon juice, milk, garlic, onion powder, salt, and pepper, then blend until smooth and creamy.
Serve the warm zucchini rings with the creamy blended dip on the side.