Preheat the broiled and line a baking sheet with foil.
Heat a skillet over medium heat and add the oil. Add the onions, and sauté for 5-7 minutes until the onions are lightly golden.
Add in the garlic and chopped tomatoes. Sauté for 5 minutes, until tomatoes slightly breakdown and garlic is fragrant. Remove from heat.
Meanwhile, arrange the tortilla chips is two piles on the baking sheet. Transfer the veggie mixture evenly over the chips. Top each pile of nachos with sliced tomatoes and sprinkle with grated cheese. Transfer to the oven to broil until cheese is bubbly, about 2-4 minutes.
Remove from oven and carefully cut the foil in half, making two servings of nachos. Transfer to a plate and sprinkle with basil. Top with yogurt if using. Enjoy!
Recipe from Living Well Kitchen https://blog.memeinge.com/tomato-basil-nachos/