Australian Sweet Potatoes | Sweet Potato & Rainbow Veggie Frittata

Ingredients

• 1 large sweet potato (approx 600g) peeled, halved lengthwise and cut into 1cm-thick slices
• 1 large red capsicum, deseeded, cut into 1.5cm pieces
• 2 zucchini, sliced into 1cm thick rounds
• Salt and pepper, to taste
• 2 tbsp olive oil
• 2 red onion, thinly sliced
• 2 tbsp balsamic vinegar
• 2 cups baby spinach
• 12 eggs
• 90 ml milk of your choice
• 85 g Danish feta, and extra for serving
• 1/3 cup fresh basil leaves, and extra for serving