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Preheat oven to 425 F. (Will reduce!) Prepare a muffin tin with liners.
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Streusel: Soften or melt the butter, and use fork to mix it with the brown sugar, flour, and salt until consistency is like small pebbles. Set aside.
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Cheesecake Layer: Beat the cream cheese until smooth. Add egg and sugar; beat again until smooth.
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Muffins: Beat the butter and sugars together until creamed. Add the eggs, yogurt, and vanilla; stir until combined. Add the flour, baking soda, baking powder, and salt; mix until just combined. The batter will be thick. Fold in the frozen berries just before assembling the muffins.
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Press 1-2 tablespoons of batter into the bottom of each muffin tin. Flatten with the back of a wet spoon. Pour a spoonful of cheesecake mixture over the top. Cover with another 1-2 tablespoons of muffin batter. Sprinkle with streusel.
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Bake for 5 minutes at 425 degrees, then turn the oven temperature down to 350 and bake for another 15-18 minutes.
