Cut the chicken breasts into roughly bite-sized cubes. Finely dice the onion.
Mix 4 teaspoons flour with 1/2 teaspoon salt and pepper. Roll the chicken cubes in the flour mixture to coat.
Heat roughly 2-3 tablespoons sunflower oil with 1 tablespoon butter over medium-high heat. Fry the onion until golden yellow and translucent, about 3-4 minutes. Add the chicken cubes and fry until browned on all sides, about 5 minutes.
Pour in the 450 ml broth and 150 ml peach juice. Reduce heat to low, cover, and simmer for 10-15 minutes until the chicken is cooked through.
While the chicken simmers, cut roughly 3/4 of the canned peaches into cubes (or use more if desired).
After the simmering time, stir in the peach cubes, 1 cup sour cream, and 50 ml cream. Season with 1-2 teaspoons hot paprika powder and 1½ teaspoons curry, adjusting to taste. Add salt and pepper as needed. Heat for 1-2 minutes, stirring gently.
If the sauce is too thin, whisk roughly 1 tablespoon starch with 2 tablespoons water to create a smooth slurry, then stir into the sauce. Simmer for 1 minute to thicken.