Preheat the oven to 375°F (190°C) and position the rack in the middle.
Heat 1 tablespoon olive oil in an oven-safe skillet over medium heat, then add the chopped onion and sauté 5–7 minutes until softened.
Add the minced garlic and cook about 30 seconds until fragrant, stirring constantly to avoid burning.
Stir in the diced tomatoes with their juices, 2 cups milk, 5 dashes Italian seasoning, torn basil, thyme leaves from 2–3 sprigs, and salt and pepper to taste; heat until warmed through.
Break the no‑boil lasagna noodles into pieces and arrange them in the skillet, overlapping as necessary so most pieces are submerged in the sauce; leave about 1 inch of space at the top of the skillet.
Transfer the skillet to the preheated oven and bake uncovered for 40 minutes.
Remove the skillet and evenly top the lasagna with the sliced fresh mozzarella, then return to the oven and bake another 10 minutes, or until the cheese is melted; optionally broil for a few minutes to brown the cheese while watching closely.
Let the lasagna rest in the skillet 5–10 minutes before slicing and serving.