Mixed berry and chicken salad

Ingredients

• 1 tablespoon olive oil
• 2 small chicken breast fillets, trimmed
• 100 grams baby spinach leaves
• 120 grams punnet raspberries
• 150 grams punnet blueberries
• 150 grams feta cheese, crumbled
• 1/2 cup mint leaves
• 1 small red onion, thinly sliced
• 1/4 cup flaked almonds, toasted (see notes)
• Dressing
• 125 grams strawberries, hulled chopped
• 2 tablespoons apple cider vinegar
• 2 tablespoons olive oil
• 1 teaspoon honey
• 1 teaspoon dijon mustard