Dinner · Part 2 of 3: Instructions
Easy Slow Cooker Chicken Pizzaiola with Peppers and Onions Step-by-step instructions

- Prep
- Cook
- Total
- Serves
- 4
Before you start
Before you begin, ensure you have all your ingredients measured and ready to go. Wash and pat dry the chicken breasts to ensure they are clean and free of excess moisture. Slice your bell peppers and onions into uniform strips to help them cook evenly.
Having your crushed tomatoes and dried oregano measured out will make the assembly process quick and efficient, allowing you to get the slow cooker started in just a few minutes without any unnecessary delays.
Ingredients at a glance (5)
- 4 pieces boneless skinless chicken breasts
- 1 can (28 oz) crushed tomatoes
- 1 tsp dried oregano
- 2 cups sliced bell peppers (red and yellow)
- 1 medium yellow onion, sliced
Instructions
Assembly Phase
- Prepare the Slow Cooker BasePlace the boneless skinless chicken breasts into the bottom of the slow cooker insert. Ensure they are arranged in a single layer to allow for even cooking throughout the process.Look for Chicken is arranged flat in the base of the insert.Tip Pat the chicken dry before placing it in the cooker to remove excess moisture.
- Add Aromatics and SaucePour the crushed tomatoes over the chicken breasts. Sprinkle the dried oregano evenly over the top, then scatter the sliced peppers and onions over the entire mixture to cover.Look for The chicken is completely covered by the tomato sauce and vegetables.Tip Layering the vegetables on top keeps them slightly firm during the long cook time.
At the end of this phase, the chicken should be neatly arranged in the bottom of the insert, completely blanketed by the crushed tomatoes, dried oregano, and the colorful layer of peppers and onions. The slow cooker should be covered securely to ensure that the moisture and heat remain trapped inside during the cooking process. Verify that the lid is tightly sealed and the setting is adjusted to low before moving on to the next phase of the cooking cycle.
Slow Cooking Phase
- Slow Cook the MealCover the slow cooker with its lid. Cook on low for 4 hours until the chicken is cooked through. Check that the chicken reaches an internal temperature of 165°F (74°C) to ensure it is safe to eat.Look for The chicken is opaque and white throughout with no pink remaining.Safe temperature 165°F (74°C) internal temperature (poultry)Tip Avoid lifting the lid during the first few hours to maintain the consistent internal temperature.
During this phase, the chicken will transition from raw to fully cooked. You will notice the aroma of the tomatoes and herbs filling the kitchen. The vegetables will soften significantly as they release their juices into the sauce.
Check the progress near the end of the time by testing the chicken's internal temperature. The meat should be tender, and the sauce should appear rich and thickened, indicating that the flavors have successfully melded together for a delicious result.
Resting and Serving Phase
- Rest and ServeOnce the chicken is fully cooked, turn off the slow cooker. Let the chicken rest for 5 minutes before serving. This allows the juices to redistribute through the meat, ensuring a tender result.Look for The meat is tender and easily lifted with tongs.Safe temperature 165°F (74°C) internal temperature (poultry)Tip Serve directly from the slow cooker to keep the dish warm for everyone.
Once the cooking time is complete, the dish should be allowed to rest briefly. This resting period is crucial for the juices to settle within the meat, ensuring each bite remains succulent. The final dish should look vibrant, with the cooked chicken breasts easily separating under the weight of the softened peppers and rich tomato sauce. It is now ready to be served hot, providing a comforting meal that is easy to portion directly from the cooking vessel.
Common mistakes
A common mistake is overcrowding the slow cooker, which can lead to uneven cooking; ensure the chicken is in a single layer. Another issue is removing the lid too frequently, which causes significant heat loss and extends the cooking time.
Avoid using frozen chicken, as it may not reach a safe temperature quickly enough in a slow cooker. Finally, do not overcook the vegetables by adding them too early if you prefer them to have a slight crunch; following the layering instructions is key.
How to tell it’s done
The dish is considered done when the chicken breasts are opaque white throughout and show no signs of pink in the center. Use a meat thermometer to verify that the thickest part of the chicken has reached a minimum internal temperature of 165°F (74°C).
The sauce should be thickened and fragrant, with the vegetables softened but still holding their shape. If the chicken is not quite ready, continue cooking for another 15 to 20 minutes before checking again to ensure safety.
- Poultry: 165°F (74°C) in the thickest part
Up next · Part 3 of 3
2 variations · storage & make-ahead · 3 answers · printable card
Tips, FAQ & printable recipe (Part 3)← Back to the ingredients (Part 1)