I’ve made other soda crackers and they haven’t been crispy. I think the secret is in the fat content. I looked at tons of recipes and then settled on a combination.
Crispy Soda Crackers
2 cups whole wheat flour
2 tbsp. sugar
1 tsp. baking powder
3/4 cup butter
Milk (about 1 1/2 cups but I didn’t measure)
Mix dry ingredients together. Cut in butter with a pastry cutter. Add milk until mixture forms ball. Divide dough into four balls. Roll each ball on floured surface to 1/4″ or less thickness. Transfer to baking sheet. Sprinkle with salt to taste. Score dough in the size you would like your crackers to be. Prick crackers with fork. Bake at 425° for 10 or more minutes or until golden brown. Watch closely. Cool on rack.