2 c. Bisquick baking mix
1/4 c. sugar
2 tbsp. butter, softened
1 egg
3/4 c. fruit flavored yogurt (about 8 oz.)
1 tsp. vanilla
Streusel (below)

Heat oven to 375 degrees. Grease square pan, 8 x 8 x 2 inches. Mix all ingredients except Streusel; beat vigorously 1 minute. Spread in pan; sprinkle with Streusel. Bake until wooden pick inserted in center comes out clean, 30 to 35 minutes. Cool 10 minutes; cut into squares. 9 servings.

STREUSEL:

1/4 c. Bisquick baking mix
1/4 c. sugar
2 tbsp. firm butter

Mix Bisquick, sugar and butter until crumbly. Stir 1 tablespoon grated lemon or orange peel if desired.