Preheat oven to 425°F. Line a large baking sheet and a small baking sheet with foil and spray with olive oil.
Remove leaves and trim end of cauliflower, leaving core intact. Place cauliflower core side down and slice in half from top to bottom. Cut each half into three steaks so you have 6 steaks.
Place steaks on large baking sheet and spray or brush steaks with 1 tablespoon of olive oil. Bake for 25-30 minutes or until tender.
Spread green beans on smaller baking sheet and bake for last 15 minutes of the cauliflower baking.
In a small bowl, combine minced garlic, parsley, panko, cheese and 2 tablespoons of olive oil.
Combine tomatoes, 1 teaspoon of olive oil and salt and pepper.
Sprinkle panko topping over cauliflower steaks and add tomato mixture to the baking sheet with the green beans. Bake both sheets for another 5-7 minutes until panko topping is lightly browned, then serve immediately.