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To make the filling: Place the strawberries and the sugar in a medium saucepan. Heat the strawberries over medium heat until bubbly. Simmer the mixture for about 30 minutes, or until the strawberries melt down into a nice sauce (chunky is OK). You should have about 1 1/2 cups of filling - if not, add some jam to round it out. Set aside to cool.
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To make the crust: Place the flour, muesli, brown sugar, baking soda, and salt in a large mixing bowl. Using a pastry blender, cut in the butter until the ingredients are evenly mixed and crumbly.
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Pour about 3/4 of the crumb mixture into a greased 9"x9" or 11"x8" pan. Press down on the mixture until you have an even and firm crust on the bottom of the pan.
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Spread the filling evenly over the crust. Then sprinkle the remaining crumble mixture evenly on top (no need to press down).
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Bake at 350 degrees for 30 minutes or until lightly browned.