Preheat oven to medium 180. Grease and line a shallow, rimmed baking tray with baking paper.
Heat one tablespoon of oil in a frying pan on medium. Add bacon, garlic and onion. Stir fry for 3-4 minutes until the mixture starts to caramelise, tossing to avoid sticking. Add capsicum and spring onions. Cook for another 2 minutes until glossy
Remove from heat and scrape the pan-roasted veggies into a large bowl. Add the zucchini, sweet potato, cheese, parsley, eggs, milk, flour, remaining tablespoon of oil and seasoning to the bowl. Make sure you season the batter well with salt and pepper.
Mix gently with a wooden spoon until thoroughly combined.
Pour into the prepared tin and bake in the oven for approximately 35 minutes until golden on top and cooked through.
Turn off the oven and let the slice sit in the warm oven for 5 minutes.
Remove from the oven and cool completely. Cut in squares and enjoy