When a recipe calls for oil you can use melted butter instead of the oil in the recipe.
And when using the melted butter instead of oil in the recipe you use the same quantity specified in the directions (for example, if it calls for 1/3 cup of oil, use 5 1/3 tablespoons of butter).
Melt it down, then let it cool a bit.
The ratio of applesauce to substitute for oil is a 1:1 ratio.
So for example if the recipe calls for 1/4 cup of oil, use 1/4 cup of applesauce.
This works perfectly with muffins and quick breads.
When substituting butter for 2/3 cup of oil you would use about a 1/2 cup of butter to equal 2/3 cup of butter.
You can fry in butter.
Butter is mostly fat and oil so you can use butter to fry foods with.
Butter is usually a bit healthier to fry foods with than regular cooking oils are.
However while you can fry foods with butter in a skillet you cannot deep fry foods in butter as the butter cannot handle the heat of the deep fryer.
The butter can't handle the heat of the deep fryer; it will brown and burn before you reach deep-frying temperatures.
Although frying foods in a skillet with butter is okay as the butter can handle the heat of skillet frying.
I fry eggs and other foods in the skillet with butter and never had any issues doing so.
I love the taste the butter gives the skillet or pan fried foods.
However when you're actually deep frying foods you need to use cooking oil that can handle the heat of the deep fryer.