Want to watch your fat intake? Then use avocado instead of butter when you're adding it to the mixer. You would be able to cut an amount of saturated fat in your muffins, cakes or any of your baked goods. And here's the best part: It'll be just as delicious and rich. The folks at The Kitchn explain:
You can substitute avocado for butter in a 1:1 ratio, but since it doesn't melt the same way it won't coat your dry ingredients the same. You need to increase your wet ingredients a little to compensate. In my kitchen, I just substitute avocados for half of the butter instead.
Unlike butter, you'll need to mash up the avocado really well and get it to be as smooth as possible. The Kitchn notes that you may need to decrease your oven temp about 25 degrees if you're going for a 100% substitution, just to prevent over-browning.