Muffins wet and heavy in middle

I'm a novice Baker. I started by making muffins but I'm failing. They never turn out the way they are supposed to. They are sticky and wet in the middle even though the outside is baked. I baked them in silicone trays in my microwave using the convection feature for 45 mins then added an extra 15 for 180c.
My ingredients were:
2 cups spelt flour
0.5 cup coconut milk low fat tetra one
0.5cup mineral water
1tbs ACV
1.5tsp baking powder
0.5tsp baking coda
1tbs vanilla powders.5tbs cinnamon
3 ripe bananas

I'm very frustrated as I've tried changing the baking trays, the temperature, the amount of baking powder but nothing changes. What am I doing wrong?

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1 Comment

Bakingmuffins2022 October 7, 2022
He is what they look like inside. I used the jumbo trays also
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