Preheat your grill or grill pan to medium-high heat.
Season chicken breasts with salt, pepper, and garlic powder.
Brush the grill with olive oil to prevent sticking and place the chicken breasts on the grill.
Grill for about 7-8 minutes per side or until the internal temperature reaches 165°F (74°C).
Remove from the grill and let rest for a few minutes before slicing.
Preheat oven to 350°F (180°C) and line a baking sheet with parchment paper.
In a bowl, mix together almond flour, coconut flour, baking powder, salt, egg, olive oil, garlic powder, and Italian seasoning until a dough forms.
Roll out the dough into a thin layer and cut it into small cube shapes.
Bake for 12-15 minutes or until golden and crispy. Let cool.
In a small bowl, whisk together mayonnaise, sour cream, Parmesan cheese, anchovies, lemon juice, Dijon mustard, and minced garlic until well combined.
Season with salt and pepper to taste.
In a large salad bowl, toss the chopped romaine lettuce with the Caesar dressing until well coated.
Add the sliced grilled chicken and keto croutons to the salad and toss gently.
Sprinkle with shaved Parmesan cheese.
Serve immediately for the best texture and flavor.