Fry the bacon cubes in a pan until crispy. Add the breadcrumbs, toast until golden and set aside.
Cut the chicken breast fillets into slices, season with salt and pepper. Fry until golden in a hot pan with 3 tablespoons of oil. Pour in the chicken stock and cooking cream, bring to the boil and cook covered for about 3 minutes over a mild heat.
Blanch the cauliflower in plenty of boiling salted water for 3 minutes, drain and drain well. Tie the sauce with a sauce thickener, season with salt and mustard.
Mix in the cauliflower and heat for 3 minutes, without letting the sauce boil. Serve sprinkled with the bacon crumbs.