Blot cherrie to get the moisture, and toss in 1 tsp flour
In a small bowl, combine cherries, cornstarch, a few teaspoons of sugar, and 1 tbsp lemon juice, stir, and set aside
In a large bowl, combine melted butter and sugar
Whisk together flour, baking powder, baking soda and salt
Add dry ingredients and stir with a fork until it has a crumbled texture
Put 3/4 cup of crumble mixture aside
Add the rest of the crumble mixture into a well-greased or parchment paper 8" pan and press down so it's evenly distributed across the whole pan
Spread out cherries evenly across the bottom layer, and then layer the pears on top of the cherries
Sprinkle 1/4 cup of sugar across the fruit and then top with 1/4 cup of lemon juice
Take the remaining crumble mixture and drop by tablespoons over the top of the fruit
Bake at 375 degrees f in the oven for 20-25 or until the top is golden brown
Allow to cool on a wire rack for 30 minutes before slicing into squares