Zucchini Noodle Salad with Creamy Avocado Dressing

• 4 zucchinis
• 2 cup baby spinach
• 0.25 red onion, sliced
• 60 g danish feta
• 2 tbsp flaked almonds, toasted
• 1 ripe avocado
• 0.25 cup extra virgin olive oil
• 2 tbsp apple cider vinegar, lime or lemon juice
• 1 tsp salt
• 0.25 cup fresh basil