Chop 2 medium zucchinis into circles then quartered, chop 1 cup cherry or grape tomatoes in half, and measure out 1 cup frozen corn (no need to cook beforehand; it will heat in the skillet).
Heat 1 tablespoon olive oil in a skillet over medium heat. Add the 4 minced garlic cloves and cook 30 seconds. Next add the 2 chopped zucchinis and cook for 4-5 minutes, stirring occasionally, until it starts to soften when poked with a fork. Add more olive oil during cooking if needed.
Now add 1 cup frozen corn, along with spices: ½ teaspoon onion powder, ½ teaspoon dried oregano, ½ teaspoon salt, ¼ teaspoon ground black pepper, ¼ teaspoon granulated sugar, and ¼ teaspoon red pepper flakes. Stir to combine. Cook for 1 minute.
Add 1 cup halved cherry tomatoes stirring to combine. Cook for another 1-2 minutes until the tomatoes soften and zucchini is tender when poked with a fork. Add more olive oil during this stage if needed.
Remove the skillet from heat and mix in 2 chopped green onions. Now it's ready to serve.