Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make blueberry cream cheese muffins [title] Preheat the oven to 350 ° f. [title] Combine the cooled butter, sugar, and vanilla in a medium-sized bowl and stir well. [title] Add the egg and egg whites, and beat them in well.

Ending1: [title] Stir in the eggs one last time, then add the blueberries. [title] Add the flour, baking powder, and salt, and beat them in very well. Ending2: [title] Pour in the milk and stir well. [title] Combine the flour, baking powder, and salt in a separate bowl. Ending3: [title] Add the oats, and beat them into the butter mixture as well. [title] Pour in the well oats and stir them a little more in. Ending4: [title] In a separate bowl, beat the flour and powdered sugar. [title] Gradually add in the flour and vanilla, until you get a nice smooth dough, about the thickness of a jiffy cake.

Answer format: ending1/ending2/ending3/ending4