Place chicken thighs in a 6-quart crock pot. Sprinkle with Ranch and Au Jus seasonings.: The smell of the raw chicken is mild and slightly sweet, and when arranged evenly it allows heat to circulate for uniform cooking. Make sure pieces are in a single layer or lightly overlapped so each piece meets consistent heat. If you crowd the pot too tightly, the center may cook slower and end up less tender.
Add peppers and pour pepperoncini pepper juice over chicken.: As the dry packets hit the surface, you will notice an immediate aroma of herbs and gravy powder. These seasonings dissolve and infuse while the chicken cooks, creating a savory profile. Be careful not to add extra spices at this stage; the packets provide concentrated flavor and extra salt could make the dish too salty.
Scatter butter slices evenly over chicken. Cover and cook on LOW for 5 hours.: The bright, vinegary scent of the pepperoncini juice will lift the overall aroma and cut through the richness of the butter and seasonings. The peppers will slowly release flavor, softening as they cook. A common slip is pouring too much jar juice, which can make the pot overly acidic and mask the savory notes.
Open crock pot and shred the chicken. Add broth and stir in frozen noodles. Cover and cook on HIGH for 1 hour.: The butter will slowly melt into the cooking liquid, giving the dish a silky texture and rounding out the sharpness from the peppers and seasonings. Distributing it evenly ensures no one area is overly greasy, and it helps form a cohesive sauce. Avoid placing all the butter in one spot, as it can leave uneven patches of fat.
Cover and cook on LOW for 5 hours: During these hours, the chicken will transform, the meat fibers relaxing and the aromatics marrying in the broth. You should detect a steady, homey fragrance as the pot simmers slowly. Resist the urge to lift the lid frequently, because each peek lets heat escape and lengthens cooking time.
Open crock pot and shred the chicken: At this point the chicken should be tender and easy to pull apart with forks, releasing juices that enrich the broth. Shredding by hand gives varied textures that make the dish feel homemade. One mistake is shredding while the meat is too hot to handle safely, so use tongs or let it rest briefly to avoid burns.
Add broth and stir in frozen noodles: Pouring the chicken broth wakes up the aromatics and provides the hot liquid needed to cook the frozen egg noodles . Stirring ensures the noodles are fully submerged and start to separate. If you add the noodles in clumps, they may stick together and cook unevenly, so break them apart gently as you stir.
Cover and cook on HIGH for 1 hour: The higher heat will bring the liquid up to a lively simmer, cooking the frozen noodles through and melding flavors. Expect a comforting steam and the sound of the pot settling into a steady bubble. Keep an eye on texture toward the end of this hour, because overcooked noodles become too soft and lose structure.