Cook the pasta. Bring a large pot of water to a rolling boil.
Add a pinch of salt and cook the pasta until just past al dente so it’s soft but not mushy. Check often; toddlers do better with a tender texture.
Cool it down. Drain the pasta and rinse briefly under cool water to stop the cooking and prevent sticking. Shake off excess water well so the dressing clings later.
Prep the veggies. Chop everything into very small, toddler-friendly pieces.
If using firmer veggies like carrots or peas, steam them lightly until soft and let cool.
Mix the dressing. In a small bowl, whisk olive oil, yogurt, lemon juice or vinegar, and Dijon if using. Taste and adjust: add a touch more oil for richness or a splash more acid for brightness. Keep salt minimal.
Combine in a large bowl. Add cooled pasta, protein, veggies, and cheese to a big mixing bowl.
Pour in most of the dressing and toss gently until everything is lightly coated.
Adjust texture and flavor. If it looks dry, add more dressing or a spoonful of yogurt or olive oil. Stir in chopped herbs.
Chill or serve. You can serve right away slightly warm or at room temperature, or chill for 30–60 minutes to let flavors meld. For very young toddlers, serving closer to room temp can be easier.
Season per eater. Keep the base mild for kids.
Adults can add a twist of black pepper, extra lemon, or a sprinkle of chili flakes to their own bowls.