Pineapple-Cheese Sourdough Muffins

I have in my notes this recipe was "great". I remember how good they were and it was back in the '80s. I am a sucker for anything with cheese, or pineapple for that matter. The smell that fills the house while they bake is amazing. The recipe takes 1/2 cup of sourdough starter which should be removed from the refrigerator a few minutes before using. This recipe makes 15 to 18 muffins.

1-3/4 cups all purpose flour
2 teaspoons baking powder
1/4 teaspoon baking soda
1/2 teaspoon salt
1/2 cup sugar
3/4 cup shredded Cheddar cheese (3 oz)
1 egg
1/2 cup sourdough starter
1/3 cup vegetable oil
1 cup crushed pineapple
1/2 cup milk

Grease 18 muffin cups or line with paper liners. Preheat oven to 375F. In a large bowl, stir together flour, baking powder, baking soda, salt and sugar. Stir in cheese until evenly distributed. In a medium bowl, beat the egg. Stir in sourdough starter, oil, pineapple with juice and milk. Add to flour mixture. Stir with a fork until the dry ingredients are just moistened. Fill prepared muffin cups 2/3 to 3/4 full with batter. Bake in preheated oven 18 to 20 minutes or until golden brown. Remove from muffin cups. Serve hot.