Step 1: Cook the chicken. Grab a large skillet – big enough to hold everything later! Heat up that tablespoon of olive oil over medium heat. Toss in your diced chicken pieces. Give them a good sprinkle of salt and pepper. Cook them for about 6-8 minutes, stirring occasionally, until they’re golden brown on the outside and fully cooked through. You want no pink left! Once they're done, scoop them out and put them on a plate for a moment. They'll jump back in the party later!
Step 2: Sauté the garlic. Using the same skillet (less cleanup, woohoo!), melt the two tablespoons of butter over medium heat. Add your minced garlic. Cook it for just about 1 minute, stirring constantly. You'll smell that amazing garlic aroma almost instantly. Be super careful here – garlic burns quickly, and burnt garlic tastes bitter, which we definitely don't want!
Step 3: Make the sauce. Sprinkle the two tablespoons of flour right over the melted butter and garlic. Grab a whisk and whisk constantly for about a minute. This cooks the flour taste out and makes what's called a roux – the base for our creamy sauce. Now, gradually pour in the milk and heavy cream while whisking continuously. This is key to a smooth sauce, no lumps! Keep whisking often as the sauce simmers over medium heat. It will start to thicken in about 3-5 minutes. You'll see it coat the back of a spoon.
Step 4: Add cheese and seasoning. Once the sauce is nice and thick, stir in your grated Parmesan cheese and dried Italian seasoning. Keep stirring until the Parmesan is completely melted and the sauce is beautifully smooth and creamy. Now, reduce the heat to low to keep it warm while you cook the tortellini.
Step 5: Cook the tortellini. While your gorgeous sauce is doing its thing on low, cook the cheese tortellini. Just follow the package directions – usually, this means boiling them in a pot of salted water for only a few minutes until they float or are tender. Drain the tortellini really well. Gently stir the drained tortellini right into the creamy sauce in the skillet.
Step 6: Combine everything. Remember that cooked chicken you set aside? Add it back into the skillet with the saucy tortellini. Stir everything gently to combine, making sure every piece of chicken and every tortellini is coated in that glorious sauce. Let it simmer together on low heat for just 2-3 minutes. This step is important because it allows the flavors to meld together beautifully.
Step 7: Serve and garnish. Dinner is served! Spoon the creamy Garlic Parmesan Chicken Tortellini into bowls. Sprinkle generously with fresh chopped parsley and extra Parmesan cheese if your heart desires (and mine always does!). Serve it hot and watch it disappear!