1. Cook the Chicken
Heat olive oil in a skillet over medium heat. Season the chicken breasts with salt and black pepper. Cook for about 6–7 minutes per side until golden and fully cooked. Remove from heat and let rest for a few minutes.

2. Cook the Bacon
While the chicken rests, cook the bacon in a separate pan until crispy. Transfer to paper towels to drain excess grease, then chop into small pieces.

3. Prepare the Ranch Dressing Mixture
In a medium mixing bowl, combine mayonnaise, sour cream, and ranch seasoning mix. Stir until smooth and creamy.

4. Chop and Combine the Filling
Chop the rested chicken into small pieces. Add the chicken to the bowl with the ranch mixture along with chopped red onion, celery, lettuce, and diced tomato. Gently mix until everything is well coated.

5. Add Bacon and Assemble the Sandwich
Fold most of the chopped bacon into the mixture, reserving a little for topping. Slice the hoagie roll lengthwise and fill generously with the chopped chicken bacon ranch mixture.

6. Serve
Top with extra bacon or lettuce if desired and serve immediately for the best flavor and texture.