Bring a large pot of salted water to rolling boil and add pasta immediately. Cook for 8-10 minutes until al dente, then drain and set aside without rinsing to preserve starch for sauce coating.

While pasta cooks, heat olive oil in a large skillet over medium-high heat. Add minced garlic and cook for just one minute until fragrant, then add chicken pieces with salt and pepper, cooking 6-7 minutes until golden and cooked through completely.

Add sliced mushrooms to the pan with the cooked chicken and stir well. Cook for 2-3 minutes until mushrooms release their moisture and begin browning at edges, creating deep umami flavor.

Pour in chicken broth and heavy cream, stirring constantly to combine smoothly without lumps forming. Add butter, Italian seasoning, and red pepper flakes, then simmer for 3-4 minutes to let this family pasta sauce thicken slightly and flavors meld.

Stir fresh spinach into the 30 minute pasta dinner sauce and watch it wilt in just one minute under the heat. The sauce becomes silky and rich while spinach adds subtle color and nutrition.

Add cooked pasta directly to the creamy sauce and toss gently to coat every strand. Fold in grated parmesan cheese slowly while stirring, allowing it to melt smoothly into the sauce without clumping or separating.

Taste and adjust seasonings as needed, adding extra salt, pepper, or Italian seasoning to match your preference exactly. Divide into serving bowls and garnish generously with fresh chopped parsley for brightness and color contrast.