Here’s another Kraft Oil recipe – the ‘miracle oil’ of the 1950s which I’ve written about here.
This is basically a muffin method of combining wet and dry ingredients until just blended, as is used in the Blueberry Muffin recipe.
The directions appear to call for both baking powder (‘B.P.’) and baking soda (‘soda’) are called for here. According to Baking at Home with The Culinary Institute of America (p.75),
When a recipe calls for both baking powder and baking soda, the baking soda is used mainly to neutralize an acid in the batter, while the baking powder is the element responsible for the majority of the leavening action.