Recipe using volume measurements.
Combine all the dry ingredients together.
Separately mix the cream, vanilla, oil, and eggs together until completely smooth.
Mix the two very briefly, until just incorporated. The batter should be lumpy.
Fold blueberries into the batter gently.
Top with streusel mixture if desired and bake in prepared molds at 425F until springy and a tester inserted in the center comes out clean, about 15 minutes.
The trick to fabulous muffins is to use great ingredients and barely mix them.