Pour tomatoes with their juices into 1 quart liquid measuring cup. Add water until mixture measures 1 quart.
Heat oil in large nonstick skillet over medium heat until shimmering. Add onion and 1/2 teaspoon salt and cook until onion begins to brown, about 5 minutes. Stir in garlic and pepper flakes snd cook until fragrant, about 30 seconds. Add ground meat and cook, breaking apart meat, until no longer pink, about 4 minutes.
Scatter pasta over meat but do not stir. pour diced tomatoes with juices and tomato sauce over pasta. Cover and bring to simmer. Reduce heat to medium-low and simmer stirring occasionally, until pasta is tender, about 20 minutes.
Remove skillet from heat and stir in 1/2 cup Parmesan. Season with salt and pepper. Dot with heaping tablespoons ricotta, cover, and let stand off heat for 5 minutes. Sprinkle with basil and remaining 3 tablespoons parmesan. Serve.