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Adjust oven rack to lower middle and preheat oven to 375 degrees F.
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Mix together flour, baking powder, baking soda, and salt in a medium bowl; stir in flavor ingredients of choice (see below).
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In a large bowl beat sugar with butter until fluffy; add mustard and eggs and beat until small "peas" form. Beat in flour mixture alternating with yogurt, 1/3 at a time. Batter should be thick and smooth.
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Spray muffin tins (or mini-muffin) with vegetable cooking spray. Fill muffin tins with batter and bake until golden (25 for full size, 10-12 for mini).
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Flavor ingredients.
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1 cup goat cheese, crumbled (4 1/2 oz); 1 tbsp fresh rosemary, minced; 1/2 cup Kalamata olives, chopped. OR.
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1 cup feta cheese, crumbled (4 1/2 oz); 1 tbsp dried oregano; 1/2 cup sun dried tomatoes, drained and chopped. OR.
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1 cup Parmesan cheese, grated (3 oz); 1/2 cup proscuitto, minced (2 oz); 1 tbsp dried basil.