Pumpkin & Mushroom Cottage Pie - A better choice!

Ingredients

• 1kg pumpkin
• 40g butter
• 1 tbs olive oil
• 1 red onion, finely chopped
• 200g sliced Swiss brown mushrooms
• 400g tinned diced tomatoes
• 400g black beans, drained
• 400g red kidney beans, drained
• 1 tbsp paprika
• 1 tsp garlic powder
• ½ cup water
• 2 tsp margarine
• Salt and pepper, to taste
• 300g green vegetables, steamed, to serve