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Peel ripe bananas and mash coarsely.
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Mix softened butter to mashed banana.
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Add vanilla extract and sugar to a bowl of eggs and beat well.
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Pour the egg butter mixture into the mashed bananas and mix well.
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Mix flour, baking powder, baking soda and salt in a large mixing bowl.
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Add flour mixture to wet mixture and gently fold until ingredients are fully incorporated.
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Mix in the toasted chopped walnuts, blueberries and cut strawberries.
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Prepare a baking tray with muffin cups and scoop batter about ⅔ full into each cup.
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Top with chopped walnuts, blueberries and strawberries.
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Bake in a preheated oven at 175 C until golden brown (about 20 minutes).
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Test muffin with a skewer. It is fully baked when the skewer comes out clean.