That's how I have to cook every day. I second the suggestion for a taco bar with corn tortillas or taco shells.
Barilla makes a wonderful GF spaghetti now, you could make a raw marinara sauce to go on top. I'm actually making that today--tomatoes, kalamata olives, fresh basil, garlic, red onion, olive oil, balsamic vinegar, s&p. Toasted pine nuts on top makes it "fancy," according to my 9yo. A salad, some toasted GF bread on the side, and sauteed kale will round out the dinner.
Another good summer meal is sandwiches on GF bread (Udi's is the best). I brush olive oil on the bread the toast in the oven. Spread on hummus or vegan pesto (basil, garlic, pine nuts or walnuts, olive oil, salt, whizzed up in food processor) and layer roasted vegetables on. We like to use peppers, onions, mushrooms, and zucchini slices. Add some spinach or other greens and you have a lovely sandwich. Roasted potatoes and a salad on the side.