These muffins are wonderful! I find with Anna Olson's recipes that they either work out for me or they don't, and these definitely did. Like you, I used vanilla extract instead of a vanilla bean. I used 2 6-cup jumbo muffin tins so these are nice, coffee shop-size muffins. I also will fill my tins a little less next time before spooning in the jam. I found that I didn't have enough batter for the last 3 or 4 to put over the jam. They still tasted great!