Step 1: In a medium bowl or a jar with a tight-fitting lid, combine the red wine vinegar, minced fresh garlic, dried oregano, dried basil, onion powder, salt, black pepper, and red pepper flakes (if using). Whisk or shake vigorously until well combined.
Step 2: Slowly drizzle in the extra virgin olive oil while continuously whisking or shaking. Continue until the dressing is well emulsified and appears smooth and cohesive.
Step 3: Taste the dressing and adjust seasonings as needed. Add more salt, pepper, or a pinch of sugar or honey if you prefer a slightly sweeter profile.
Step 4: For best flavor, let the dressing sit for at least 15-30 minutes before serving, allowing the flavors to meld.
Step 5: Store any leftover homemade Italian dressing in an airtight container in the refrigerator for up to 1 week. If the olive oil solidifies, let it come to room temperature and shake well before using.