Cut the chicken breasts into bite-sized pieces (about 1-1.5 inches), which will cook faster and distribute better throughout the soup than whole breasts. Cut potatoes into ½-inch cubes and celery into ¼-inch pieces for uniform cooking. Dice the onion finely and mince the garlic. In a small bowl, combine all the dry spices: garlic powder, onion powder, dried thyme, paprika, salt, pepper, and dried rosemary. This mise en place ensures everything is ready before cooking begins and prevents scrambling later.

Melt the butter in a medium saucepan over medium heat until foaming. Add the flour and whisk constantly for about 1-2 minutes to create a smooth paste (roux), which will cook out the raw flour taste. Gradually whisk in 1 cup of the chicken broth first to prevent lumps, then slowly add the remaining 2 cups while whisking continuously. Increase heat to medium-high and bring the mixture to a gentle simmer, whisking frequently for 4-6 minutes until the broth thickens noticeably—it should coat the back of a spoon. This creates the creamy base that gives the soup its pot pie character.

Remove the thickened broth from heat and stir in all the spice mixture from Step 1. Pour this seasoned sauce directly into your slow cooker along with the chicken pieces, potatoes, celery, diced onion, minced garlic, and frozen mixed vegetables. Stir everything together thoroughly to ensure the chicken is well-coated with the broth and spices are distributed evenly. I like to do a quick taste at this point by dipping a spoon in—it helps me decide if I need to adjust seasonings before the long cook time.

Cover the slow cooker and cook on low for 6-7 hours, or on high for 4-5 hours, until the chicken is completely cooked through and the potatoes are fork-tender. The long, gentle cooking allows the flavors to meld together while keeping the chicken moist. Avoid lifting the lid frequently, as this releases heat and extends cooking time unnecessarily.

Once the soup has finished cooking, remove the lid and stir in the heavy cream to add richness and achieve that signature pot pie soup texture. Taste the soup and adjust salt and pepper as needed—I find that after hours of slow cooking, flavors can become muted, so a final seasoning boost is almost always necessary. If the soup seems too thick, add a splash more broth to reach your desired consistency. Stir in the optional fresh thyme and parsley for brightness and aroma just before serving.

Ladle the hot soup into bowls and top each serving with a warm biscuit—either homemade for that from-scratch touch or store-bought for convenience. The biscuit softens slightly as it sits in the warm soup, giving you that authentic pot pie experience in soup form.